Re: self-conscious, and ruining my life.
Well when I'm feeling particularly negative about myself in my appearance, here's what I do:
I stand in front of a full-length mirror and examine myself from lots of angles. I list the good things about myself- toned calves, skinny arms, etc. Then I list the bad things [which can go on forever] such as enormous thighs, a bit of a gut, too-small breasts, etc. Then I go back to each of the bad things and imagine how much WORSE they could be. I imagine in my mind every possible negative physical aspect I could ever have, and it makes me grateful for the body I have. I remember that I'm not perfect, but I could be a lot worse off.
Then, I remember how much more substance I have besides my physical appearance, which also makes me feel much better about myself.