Why don't guys like thinner girls?

hey so my names Shelby and I'm 14 years old, & I weight 107.4 lbs. All my life, everyone always called me skinny, and gave me nicknames like "skinny Minnie" or "stick". And my own family gave me those annoying nicknames. They don't understand how much it hurted me to be skinny, and those rude names. Am I being too sensitive, or do I have the right to be disappointed? Anyways, so I don't understand why guys don't like thinner girls, like me. I have a sister and shes thicker than I am. People say that she has a fuller waist than I do, and she has an a**. All of the guys that we meet tend to like her over me. I blame it because of my thinness. I hate being thin and I'd rather be fat any day. Movie, media, and magazines seem to make being skinny a mandatory thing to be if you want to be beautiful. And thick girls bag on them saying that they're brats and stuckup, ruining the outlook on natural thin girls. I can't control my natural thin weight, nobody really can either. I just hate how guys think skinny girls are bony and breakable. That they don't have cushion and they're not cuddly. I hate how guys describe thin girls like me. I hate being skinny. Somebody give me advice? ..