I am 13 and I want to lose my weight, I want to lose 23 pounds or more

Hello im 13 years old and i want to lose weight ive been on a diet for 4 months and ive lost about 23 pounds but i want to lose more, i dont know why but know its been really hard to lose weight i want to eat everthing and its so hard for me to go ride my bike or walk or do walking videos on youtube, i have to go to my nutritinalist september 30 and i havent lost anything maybe a pond but the ast time i went there it was august 18 can someone help me loose at least 10 to 5 pounds before but without pills and the biggest problem now is im eating sweats and stuff like that without my mom knowing so can someone please help me PLEASE