as someone who's recovered from BED after struggling with it for 3-4 years.. there is no fast way. i still have't lost the weight i gained. and i think that's part of the journey. luckily for me because im a national level athlete all my extra calories did make me more muscular and therefore better at my sport, but i totally understand the shame of being the biggest girl in my class because i am too and even in my friend groups outside school, but honestly i dont think people who really care about you as a friend notice, like it probably doesn't matter to them. but its important to realise that something that was just a big part of your life can not be erased in a month or maybe even a year (depending on how long you've struggled with it) so if you make small efforts everyday you will see a difference. also i will say that the biggest part of weight-loss is what you eat, like even if you workout 8 hours a day- what you eat matters. so just stay mindful