Am i bipolar?

I am 13 and I usually get VERY hyper and extrememly happy, and i am amused by the littlest things... then sometimes i am extremely sad and i just want to go home and cry.i feel very hopless and pessimestic. I will ignore my friends, and just mope around in school, then get randomly hyper again. i will talk like crazy and think about everything. i treat people very rudely sometimes, i cant concentrate well and once nd a while i will see things that arent there......I dont sleep at night, and i never have much of an appetite. if not bipolar than what???