OMG I hate my weight help!!!

every day I wake up and say, " stop eating" and I look at myself and cry I hate it! I was sick and was in my bed for a week and had tonilits and I'm really tall I'm 176 cm I think... In the 100s and I'm the 2nd tallest in class. when I eat I always feel guilty and try to vomit but nothing happens, I eat dinner then do it sometimes I'll skip all my meals or I eat 1 meal a day witch is every day lately! I haven't worn a bikini in 2 years to shy and my belly goes right in like curry and my nan, mum, freinds say I'm not fat stop siting, I'm like so shy to tell my mum for help only freinds but elusive I run on the spot like in my spare time, push ups, yoga, dance and school basket ball and this is becoming a addiction HELP!!