I Neisa...welcome. You will get a lot of great advice and support on this board.
First, I want to suggest something. You said your mom cooks all the meals and you basically can't eat anything else. What if you made your own meals? If you learned how to cook you could control what you eat better. Cooking is not hard either and it is a lot of fun. I find it to be a good stress reliever also.
Secondly, do you exercise at all? We all know that exercise is a key component in weight loss. You don't have to belong to a gym to exercise either. A simple 30 minute walk around the neighborhood is exercise.
Third, I have to tell you not to deprive yourself. I tried that so often and it backfires. Chocolate and sweets are huge for me as well. I make sure to keep a package of the 60 calorie, sugar free chocolate pudding on hand. I also have chocolate rice cakes and Smart Ones makes frozen "sundaes". Smart Ones is a weight watchers frozen food. The little sindaes and fudge cake are 1 small serving and they do the trick for me when I want sweet. I can tell you that I will not deprive myself. If I want it I'm gonna eat it. My hubby is making me steak for my bday dinner tonight and then we are going to get ice cream. I would usually get like a large blizzard, but I am going to have a mini blizzard instead. I didn't eat bad before, but there I always room for improvement. Make better food choices and learning how to cook is a huge step in doing so.
Good luck on your journey and I hope you keep us updated!