weight issues

Im 16 and I weight 247 pounds im 5'2 i atleast wanna be 150 by my 18th bday is there anything i can do? I tried diets and going vegitarian that didnt work and my allergy issues keep me from outside activity and my cramped up house keeps me from doing inside activity and its super hard with my family because sarcastic and being rude or laughing  about me wanting to change my uncle says i need to walk up and down the block cause im lazy