I think im depressed or something.. please help!!!!?

I always compare myself to other people and I hate just being like a stereotypical teenager who doesn't have confidence but I am overweight like I am not fat but I am not like thin and i HATE being in the middle. I mean i am happy i am not fat but still. i just hate all my clothes, they all look bad. i have tried starving myself but i just can't do it. i try i really do try to workout and be healthy but i nvr feel like i did good. no matter how long i work out for i always feel like i am never going to be thin. being overweight is in my genetics but when my sister was in high school she got rlly thin. I want 2 do that to but i just dont know how. i hate feeling this way but i do and i need something to make me feel better. i always always feel fat even if i work out, i have a huge stomauch and thunder thighs.