bipolar stage 5

Could be bipolar?
I am 16. My sister had OCD and I think my dad is also bipolar. I know bipolar and OCD meet most time which is very possible that I have bipolar. Most of the time I'm happy and quiet with my family and friends. But sometimes, when one member of my family from fight me (verbal) or make a smart comment to me just went to my room and start to mourn bad when I want to kill me and I feel very useless. no body knows. Even sometimes at home I can scream / yell at someone a secound and relaxed the next. Not only occur around my period either. Im in 10th grade, but now in the4 5th grade I went through the worst year of my life and I was depressed due to family problems. Every day I began to mourn and dream to die and even try to cut myself. but I'm a bit of that stage now. At that time my father was physically abusing me and now only verbally abuses me low me a lot. I am 5,9 and 136 pounds and all I think about is my weight.
I am by no means an expert psychologist. But what might feel is depression severe. That's what I'm going through and lists some of my habits. Of course, I recommend you see a counselor about this as soon as possible. I've waited too long to solve my problems and now at 20, I'm struggling badly with keeping alive.
BIPOLAR on CAPITAL CHAOS 2006