Why does it never work? Why am I such a loser when it comes to this?

I've never really had any luck when it comes to dating. I'm basically that really nice guy the girls only want to be friends with. And I've just screwed over and chances with one half decent girl but all of the decent girls are taken. It's like they think I don't have anything to offer. I'm a very talented and not boring guy. I'm very smart with computers. I can play piano, guitar, and b guitar. I also sing really well and I'm a great actor. I'm also a competitive swimmer. And I'm 5 feet 4 inches and almost 18 years old. I'm not a weakling either because I live on a farm and I work out. And one thing that I have a great value for is fairness and honesty even if it tips out of my favor. But I can't seem to get a single girl that I actually like. They all say the nice guy thing and there is another guy.It doesn't matter what I do, not one decent girl likes me. When I say decent I mean one that doesn't drink or one that doesn't want . I feel so alone and I can't do any thing about it. Is it me or is it society going to crap? Please just put whatever advice that you've got for me.