That must be tough! "Normal" is overrated though, just work on developing your own "self" and dint' get sucked into any of the madness. Find hobbies that interest you (music, friends, reading etc), expand your friend circle (this can be a great support system), and if you need to, dint' hesitate to talk to a professional (it can be hard to be around all of that).
Some of the best writers, poets, thinkers, and doctors grew up in dysfunction....keep your focus and you'll be just fine