No one wants a relationship w me just sex?

I have never wanted a relationship just casual sex. but now im am just getting really lonely. guess act all suave and sincere when they just wanna get laid.. n they say they dont want a relationship or they dont say anything at all. Alot of them find a girlfriend immediatly after me. it seems men go for the bitchyest girls they can meet that manipulate. I am a very mellow girl have alotta the personality traits men have and not to be vain but imbetter lookin than alotta the chicks they go for.. what the hell is wrong in this situation.. idk what i am doing wrong if anything