How can i lose weight fast?

so i have been a little bit worrie about my weight.. my doctor says im avrage bt i have a little belly.. it kinda skticks out.. i can hold it in bt when i sit dow its gross! and im not very good wit dieting like i eat very healthy.. its just my fat has gotten 2 its stick out point because i dnt excerises in the winter.. :P but i need to get rid of it! i hate going swimmin sumtimes.. HELP ME PLZZ!!!!