Do you think I have Bipolar?

Im in middle school, and I feel depressed sometimes... I used to think about hurting myself.. But i dont anymore... right now I just have major insomnia or something.. because IF I do sleep, It takes me atleast 2 hours to fall asleep. Also, I have feelings like my life sucks.. Because I dont exactly have middle school under control... and I have friends, tons of friends... But I dont think I can trust them, apart from One. And.... Then sometimes I will feel like my life is great and then... I think about the bad things.. or something and feel depressed. God, i hope i dont sound childish.. I just, everytime I talk about this with my mom, she calls me a "worry wort" or "crazy". I just need a few opinions... Thanks.