Help!!

I think I am a secret eater and I dont know how to stop. At the age of 17 I weighed 7stone now at 19 I weigh 10.3. I hate to feel like this. I feel like everything jiggles, and wobbles and I just hate it. I want to go back to how I was but my eating habbits wont let me. I dont have the money to go on a proper diet but I dont know what to do. Any advice?