I am so scared i'll gain weight...idk what to do. I work out all the time.?

Like my mom was scared i was anorexic because i only ate 1 meal a day and i have athletics every school day and i would never eat at school so she made me eat more. So i began to work out so i don't gain weight and this is with athletics. I wake up and do 50 situps and 250 on my elipticle machine and then 50 lunges 50 push ups and 100 waist things and 100 jumping jacks. Also if i wake up in the middle of the night cuz im hungry i'll do 500 crunches..,50 waist things...,50 lunges and 100 waist things that help your waist get smaller. I am 130 pounds and 5"8 and a size 2 or 3. I'm in modeling. School also makes me feel really self concious because guys always make fun of me. Idk what's wrong with me but it's getting me worried. I'm thinking about not eating tomorrow because (i think) i'm gaining weight. I also take diet pills but only 2 a day. Not like 6..like over-weight ppl take. It helps me with my energy because i get tired easily. What do you think is wrong with me?