I would consider the angle between your sun, mercury and venus and your nodes quite a wide one. the more tight the square is, the more meaningful it is. so in your case it is true, there is a square there, but it is not as tight.
as for the meaning - my method is to interpret squares to the nodes as an "outlet" for the energy of balancing between the nodes. Because the south node is an energy you are familiar with and the north one is energy you need to acquire and learn, the planets with square to the nodes pointing at the way in which balancing between the nodes can be done.
in your case, these are mainly the sun and mercury (a more tight square) - sun in 4th house in Gemini and mercury in 5th house in Gemini but also venus,in 5th too' in Gemini .
4-5 houses combination can mean 2 things: one, a nostalgic creativity or creative nostalgia. the second, your own family and home: not the house you grew up in but the one you create yourself.
having sun, mercury and venus there talks about self manifestation and interactions with other people, as well as creative and interactivity talents.
I would say you have 2 ways in which you can balance the energy between your nodes: the one is to have an interactive, lively, reach family life and a nice, fine home that is open minded, free, excepted and talkative. the other is to be involved in creative nostalgia - for example, make an artistic career, focusing on home subjects and your memories.
it looks like your Chiron is being activated there too so you should consider maybe more technical methods of expression: techniques that involves measuring or technical accuracy.
these are some of the positive interpretations I see in for this position. I don't think you need to necessarily pursue a creative career because you have an opposition between these personal planets on 4-5 and planets in 11, meaning it is challenging to achieve full self expression and do it as a career.
because you are still young I don't talk about kids but this placement and constellation can also be interpreted in terms of kids.