Why is it i can only find losers interested in datin me or just wanna have sex with me?

im not the prettiest or the skinniest (i am very over weight, but not ashamed of how i look) an yet since i began datin when i was 17 (when i was much thinner an had no kids) i only could find losers interested in me. i dont believe that anythin is wrong with me that would cause every guy i meet to not be interested or just want sex an thats it. is it becuz all guys care about is sex or only wanna date skinny girls? if so, its pathetic, immature an stupid becuz theyre missin out on so much.