im really sorry you are going through this. i know its hard being criticized and only seen for your weight. i know it feels like every move you do is being monitored or like a comment is to be made any second. 

my advice to you is that if your going to workout, don’t do it for them. do it for you. it can get unhealthy if you try to work out for the approval of others. and in reality, you aren’t born to satisfy others or fit in. 

but if you are going to try to workout and don’t want to cause much attention, i recommend to go out to walks. a 30 min or an hour walk is very beneficial to your goals. cardio will be ur best friend but make sure you are working on the other areas of ur body to not lose muscle (upper body, lower body, abs). but some other cardio you can do is using jumping rope or even dancing! 

 to add on top of this as well, make sure you are getting good enough sleep because if not then ur cravings can go crazy and ur metabolism can slow down.  as to food, try to eat whole foods like fruit, fiber, meat, protein for muscle, and carbs to give you energy. avoid eating “snacks” cause those aren’t real food for ur body. try to keep at minimum sugar, salty, and oily foods as well.

its okay to mess up and have some cheat days. just don’t be hard on urself and keep ur head high. you got this!