I hate my life, I'm so depressed. Please help?

Ok it's like this....I used to be all kinds of f***ed up and was depressed all the time.never had any friends and you know the rest of the story. So one day I met this awesome person that was way more f***ed up than me, but she was happy. I asked how she can smile. She told me people see confidant before they see F**k ups. If you are confident people see this and like it. no matter what your imperfections are. People don't want to socialize with someone that thinks their a piece of s**t. Keep your head up dude, if you tell yourself something long enough you start to believe it. Maybe next time you look in the mirror, say damn i'm y!