body weight

so when I was younger I got told that I would never been as skinny as society wanted and that I would always be over weight or under weight. so when I was thirteen I decided that I was never going to be pronounced over weight because I was told that if I wasn't skinny I wasn't pretty ( but that's is wrong ) anyways back to my story I started eating less and working out constantly. I would work out for three hours every night so that I would always maintain a figure. I always got told I had a little muffin top or a "pooh pack" and I would always cry. I have always had anxiety that one day nobody would want me because I was to small or to big and so I got sad about it and worked out more. then I was 15 and 80 pounds and people made fun of me for being anorexic.

so what is a good weight for a 16 year old girl who's is 5'6?