Why are guys intimidated by curves?

Ok, I know this sounds strange, as most guys do like curves, but I feel like mine are just wasted and I might as well lose weight and become a stick insect! lol! I was basically talking to a guy friend of mine, and he said most douche bags go after chicks who have bigger asses in general, and good guys feel intimidated by the curves as they feel they are not worthy or good enough, is this somewhat true? And why? I'm sick and tired of attracting losers and want a nice guy to appreciate and approach me for once. I feel like people just judge me before even getting to know me, thinking I'm some kind of bimbo who's only good for a ƒuck and that's it. As far as I'm concerned the exterior is the icing on the cake, it's the interior that is most important right? I've been single for 4 years now, not because I'm not capable of attracting a man, but attracting the RIGHT one. So this is clearly out of choice, and I've gone passed the stage of going loony like a spaz from man withdrawal symptoms, I just feel numb and don't really care anymore. It just makes me question what is wrong with me you know? I wouldn't say I'm overly chubby or skinny, I'm a size 10, so I would say I look normal and healthy. I'm 22 and still a virgin.