Any suggestions?

My mom called me fat, she says I'm overweight, she makes fun of me because of my weight. I barely eat because of that and I'm still the same. She's made me self-conscious about my weight/my body. I'm 12 and I weigh 120 lbs and I am 5'1 all my friends are 5'0 and weigh 90 lbs (if even). I don't feel comfortable going to the pool with my friends cause my weight "problem". I don't feel comfortable doing anything now. What can I do to loose weight? Diets, workouts, not eating, nothing is working. What can I do to loose weight to make he confident with myself?