Why go on when I am ugly?

I am twenty-one years old and I get made fun of daily because I am not good looking. I have no friends. I have never had a boyfriend. I have tried to make friends with people but no one wants anything to do with me because of the way I look. This has been happening since I was twelve. I figured once I was an adult things would be better.
Well it's been nine years now. My question is, why should I keep going on when I am so unhappy with my life? I have nothing to live for since my main dream was to have kids and a husband when I grew up. Obviously since I am ugly this can never happen. I have no talents at all. Everyone calls me a loser. So why go on? I have tried for my family's sake but I think I am just a burden on them and they'd all be glad I am dead anyway.