I'm 17 years old and 5"4 weighing 155 and have stretch marks on my stomache .. i use to be skinnier before but i'm on depo-provera could it be the bc?

Yes! Depo=munchies: Yes. Depo Provera can give you the munchies. If you like depo. I suggest you consider the Levonorgestrel iud aka mirena (levonorgestrel). It has the same kind of medication as depot Provera but much lower dose. And it lasts for 5 yrs! you can take it out at anytime. Check out http://maybetheiud.Org/ and http://bedsider.Org/methods for more info on the Mirena (levonorgestrel) and depo.