How to get rid of being depressed without medication?

I'm 18 (senior in h.s.) and I've been bi-polar for 2-3 years. Right now it has hurt me the most and it's gotten to the point that I can't hide it anymore. I'm not a verbose person and I've only trusted one male teacher so far whom I told about my boy problems (Had a stalker). Anyways I have this teacher for two cles (I help him) Today I was pretty moody (which I still am) and when I entered the second period that I helped him he started to ask me if there was anything wrong (because of my facial expression; serious) I just left him hanging and raced towards the door and left...I am tired of this, I want help. I am in clubs but it does not help that much.