Hi. There are a few things that seem to be relevant to lacking a solid sense of selfhood. The general emphasis on the social signs; the Sun Chiron (1st house) semisquare; the Saturn Pluto square; the squares from Uranus and Neptune that you mentioned; the Moon semisquare Pluto; and although Jupiter gets on well with the Sun and Sun-Jupter contacts often exaggerate the sense of importance of the self, Jupiter can also dissipate the solar sense of centrality because Jupiter needs to feel part of something bigger than the self.
The earth presence in the chart is low in terms of planetary placements, because apart from Venus, only outer planets and Chiron are in earth signs. This Venus is unaspected as well as being in an element which is relatively alien to you, but I think it would be well worth the effort of nurturing it. This planet - ruling both luminaries and Jupiter - could help you to cultivate the boundaries that you seem to be lacking, especially since it is in an earth house. (The second house is a natural house of Venus, and both Venus and the second house are often associated with self-esteem.)
Since Virgo can easily express as self-scrutiny, the placement of Venus in Virgo may add to your lack of self-esteem. But by cultivating the positive qualities of this placement, you can begin to turn things around. The important thing about Virgo is that it is the last sign of the first hemicycle (half-cycle) of the zodiacal cycle. It is a sign of preparation for participation in the collective, but this preparation involves focusing on the individual self and gaining a deep understanding of what one has to offer, and how one can best purify and better the self in order to make that offering in an effective and satisfying manner. You might benefit from choosing a skill which feels like an important part of who you are, and taking steps to develop that. This skill will perhaps be Venusian in nature.
As with all of the signs in the second quarter of the zodiacal cycle, there is a need to see the results of one's individual self-expression reflected back so that one can see them. The first three signs aren't very concerned about this. Where a second-quarter sign (Cancer, Leo or Virgo) is insecure, there can be quite a strong need for validation from others. The insecure Cancer says something like, 'Show me that you need me'; Leo says, 'Show me that I light up your life'; and Virgo says, 'Show me that I am useful to you.' So its important to be aware of this tendency in Virgo, and while it is part of Virgo's natural and beneficial pragmatism to check out how one is doing using feedback from others, ultimately, there is a need to be one's own judge of what is the right way to develop and express one's skills.
There are of course various potentially problematic placements in the chart that you will be navigating as you go through life. The Mercury in Scorpio semisquare the Moon, and also conjunct the angular Mars, with the IC and Mars also in Scorpio, suggests that you weren't able to relax in your early environment - that your instinctive need for shared understanding with others (Moon in Libra) was denied by the presence of unsettling verbal, and perhaps also physical, exchanges with others. So perhaps now your need to see things from the other person's point of view is somewhat compulsive - driven by a fear of turbulence and trauma in your relationships with others.
Mercury's rulership of Venus in Virgo is another indication that the Scorpio conjunction will affect the search for loving and harmonious relationships. All this also suggests that some of the skills you can develop as you nurture that Venus in Virgo, and meet the needs of your Libran luminaries, involve using these Scorpio energies. At the moment you may feel disempowered by Scorpio-type exchanges that you have been subjected to (and perhaps outbursts that have arisen from within you in response to attacks from others or which were somehow coaxed out of you by the emotional stagnation of those around you). But as you gradually reclaim that power, things will fall into place, and you will find that, in one way or another, you will be able to have a very therapeutic effect on others. Be careful though, because until you develop more solidity may mean that the wounded are able to feed off you like parasites. On some level, your parents may already have been doing this in some subtle or not so subtle way, but I emphasise MAY as everything I'm writing here is simply speculation for you to mull over.
With the strong Jupiter, you may also have a very strong sense of justice, especially with the Libra Scorpio emphasis, and also the squares from the idealistic Uranus and Neptune. The Saturn Pluto square also adds to your natural sensitivity to injustice, especially with Saturn in Aquarius. There's a sense that you need to develop an understanding of what changes are needed in the groups in which you participate, because this kind of understanding will enhance your sense of solidity. If you don't try to develop your own opinions about things like social progress, you may too easily give the authority of Saturn away to others, thus adding to your tendency give excessive weight to the views of others.
The interaction between Saturn and Pluto could take various forms. In one sense it adds to the Moon in Libra semisquare Mercury in Scorpio, because Saturn is on the 7th cusp (associated with the first point of Libra) and also in an air sign, and also because Pluto is Scorpio's ruler.) So there is a repeating theme here, and it speaks of reclaiming your power through making your own mind up about the things that attract your attention, and finding a practical use for the understanding that you arrive at (Saturn and Virgo).
The bringing to fruition of the many potentials shown in this chart will take time and periods of determined effort. Do be patient with yourself. People with the outer planets in aspect the Sun - especially 'hard' aspects - tend to 'find themselves' later in life than those whose Sun is left more to its own devices. But the rewards to these placements are that the Sun will never stagnate, but rather will always find new and more meaningful ways to shine. And with the Leo ascendant, this will obviously be important for you.
I hope you're getting support from people around you at this time - support that is helping you to continue to heal and blossom,
Best wishes,