i don't know what to do with my disease

i was diagnosed with crohn's a little over a year ago & im so self conscious about it bc the other girl in my school that has it is thin with her disease but i'm not & no matter how hard i work my disease doesn't let me lose weight bc it makes me gain it right back & im losing hope. i do track & i avoid the foods that make me sick but my body won't let me lose weight & be who i want to be. i used to be thin & i used to be in constant pain bc of my disease for 3 years before i was diagnosed. i never wanna feel that again. & other people talk about how they have a stomach ache & it makes me so mad bc their stomach ache will go away, mine never does. & no one understands that i'm in pain they think it's nothing & im being over dramatic but it gets so bad some days that i can't even move or eat. i've missed days of track because of it. this disease is going to ruin my life & im never going to be normal.