What's love?

I want to believe in love but it's hard. All my friends have boyfriends or girlfriends and I don't know what to do. I wanna be happy I wanna try but what is there when no one knows you. I wanna be loved is that to hard to ask. Why don't you want me is it because I'm fat or ugly or something like that. I wanna feel happy I wanna feel love but I'm just a third wheel.