Why is it because i am not pencil thin i cant get a decent man to ask me out?

why cant i get a decent man to like me. all my friends are in love and have been engaged for a while or have a bf and kids and all that. i am tired of always being the third wheel and feeling left out because i dont have a bf. i want to be happy and feel good about myself but every time we go out i m left alone bec they wanna go off and do something. i want to be in love and get married and have kids. i am only 19 but when is it my turn . i feel pressure everyday to look like these models on tv. bec i dont i feel fat and ugly and they tell me that everyday. when is it my turn and when is it okay to tell my friends i am feed up. i dont want them to get mad. help someone