I'm really sorry to hear you are feeling this way, these are feelings I've experienced often too and they are never fun. I am sure that you judge yourself more harshly than the rest of the world. And remember that looks are not everything, I have a sister who is absolutely gorgeous, she is tall and thin and often gets asked if she's a model. However she has been depressed lately saying that she feels like people only ever judge her on her looks, and no one is ever interested in her personality or getting to know her, She feels like she has nothing going for her other than the fact that she is so pretty. So it goes both ways, awesome talented people think if they were prettier they would be happier and very beautiful people think if they had something else they would be happier. And NO ONE is perfect I'm sure you don't know anyone who is.
Also I just wanted to say that I have VERY frizzy curly hair, like really, it's ridiculous looking, and have hated it my whole life, however I often have people who come up to me and say they love it because it is "cool" and "unique" and they have asked how I get my hair to look like that and say they wish they had hair like that. Probably other people feel the same way about your hair! Just remember that how you see yourself and how the rest of the world sees you are very different. I hope that you can start to see the beauty in yourself. Feel free to PM me if you ever want to. Best wishes.