Insecure

Hi, I'm 13 and I am overweight I always feel insecure about my weight because a lot of the girls in my class are quite thin and have nice bodies and figures and can wear nice clothes like crop tops short shorts bikinis ect. I am always looking at diets and making goals for exercise routines ect but nothing seems to be working I have recently started the pill to help balance my hormones to help me lose weight but I still feel insecure. Is there any advice I could get thanks