I am 15 and need to lose weight! Plz help!!

Hello! I am a 15 year old female and weigh 206 pounds. I know, I am obese , I desperately want to lose weight but I live with 5 people and share my room with 2, I always ask to go to the gym but my mom doesn’t let me, always going on about “too many creeps in this world”. I am slowly seeing my self worth and self esteem diminishing every time I look into the mirror. I feel like I keep getting bigger and bigger each day.

Any tips or advice?! All is appreciated!!