Okay, whomever you've been hanging out with all your life, is obviously blind. After reading your post and clicking on the picture, I was honestly expecting you to look like King Kong or the Wicked Witch of the West, I was NOT expecting you to be so attractive.
Why do you want to change yourself? I don't get it. You're actually quite stunning, imo. You're not far at all from esthetically pleasing. Your hair and eyes are quite beautiful. And let me tell you something, whoever tells you otherwise has psychological problems, chica. It's not you, it's definitely them.
I wouldn't change anything about you. And if you're afraid, because of your physical appearance, that you're never going to have a steady relationship or get married, you haven't met the right person yet. The man you'll want to spend the rest of your life with, will think the sun shines out of your butt no matter what. Ugly, fat, thin, good hair day, bad hair day, he'll love you for *you* not for who you think you need to look like.
Definitely you should achiever your weight-loss goals simply to be healthier in the long run. As far as cosmetic surgery, nix the idea. It's absurd. Trust me, there are people out there FAR worse off then you. In fact, they're at a different end of the spectrum. You know, the kind of people who have a tendency to resemble animals, yeah, those ones. Don't laugh, it's true. Unfortunately.