Yes, I understand this all too well, and being 16 it probably feels more difficult than being 24. Maybe the pills You're on aren't right for You, talking to you're doctor can help determine that. Just remember to be yourself and your friends and relationships need to be sat down and talked to about your condition. It will probably be hard to do, and some might run in the other direction, those who matter and truly care will stick around and even help you to acknowledge when you're being manic.
I wish I could say it gets better/easier, but keep your chin up