The main things I would look for are (a) the planet ruling the 7th house cusp, (b) any 7th house planets, and (c) Mars.
Of course, we'd look at your chart as a whole, as well. Traditionally the sun signifies a woman's husband (hence Animatrix's reading) but I normally would assign the sun to your own identity. But obviously, you'd want someone compatible with your Virgo ID.
Mercury is a strong player in your chart, in its own sign of Virgo and conjunct your sun. With Mercury-ruled Gemini on your 7th house cusp, you'd want someone to measure up to your level of intelligence.
With Mars conjunct Jupiter in Libra, you might want someone with strong principles of fairness and high-minded courses of action. If he's got the soul of a philosopher, so much the better. With Mars involved with both Jupiter and a Neptune square, however, it will be important to be realistic and grounded when you've met someone who might be Mr. Right, because you may have an initial tendency to idealize him beyond what the real man is like.
You have Venus in Leo in the 7th. Normally I'd associate Venus with your own sense of femininity-- having someone who admires and appreciates you is important to most women, but I think even more so in your case. Keeping in mind that a happy Leo Venus also gives back in return.
In terms of not having had a committed relationship yet: time is on your side. The right man will be worth waiting for.
One thing to contemplate, in the interim, however, is whether you suffer from low self esteem or are highly self-critical. I'm looking at your sun conjunct Chiron and moon conjunct Saturn, square Pluto. If so, this can have two effects. One is that you may privately think that you don't deserve to be happy, so you sometimes sabotage your own chances to establish a loving relationship. Two, is that when you're unhappy with yourself, there is a very human tendency to take it out on the person next to you. Needless to say, criticism can have a negative effect on a relationship. Saturn conjunct moon can make you appear emotionally cold-- not because you are so, on the inside, but because this is how you've learned to protect yourself against hurt feelings.
Having said all of this, when you meet a Person of Interest or contemplate settling down with him, whether or not you're a good match goes by your synastry (chart comparisons) vs. what you are attracted to in the hypothetical.
I see no reason why you cannot have a loving fulfilling relationship in your life.