I have many things i would like to say that i would do. Read more, learning about nature, travel and work abroad, interact more with people and like you say – be more streetwise, learn more about the real life. Smoke a joint now and then, not be living so overprotected and isolated from everything. I might want to study something like biology, herbalism, anthropology. Have friends and have some fun with guys now and then. Go to the movies and to the theatre. Go to the bars until early morning and talk about life with whoever i meet. Learn to sail and to surf and perhaps work on a boat for a while.
And a lot more things.

But in general, if i could do it over, i would just respect myself a bit more. Do the things that i want to do and not worry about what others think of me, if i’m good enough for others. Just do it and have fun and learn, and do it for myself.