I always comment on how I hate my thieghs or how my stomach looks. I don't think I look good on most bikinis and I really want to change all that but I think about it and I feel like if I try it would maybe just create muscle but not make them skinnier.

Forget what society thinks and only try to appeal to yourself. You're beautiful, it's society that's the ugly one.
Always hide your weakness.
But then, I guess the companies who sell us products to tint our eyelashes will continue to convince us it's important. I mean, they're not going to hamper their profits, are they?
of course, in a healthy way(e.g~eat healthy, stay active)