I cant break my habbit of junk food?

Hey guys. All my life, ive had ALOT of junk food. To get me to stop crying as a baby, me dad would shut me up by giving my ice cream. Now i eat ice cream everyday. Il have a bowl of cheetoes for a snack. I stick to the same foods now- i mostly eat chicken, mac-n-cheese, and not much of a verity. I dont like to try new foods. I hate all fruits and vegetables except for corn and sometimes broccoli. Im very avtive, so i am still skinny. Im only twelve. I know im young, but i fear that my bad habits will effect me in my future. I try to eat like an apple or not eat ice cream, but somehow i always resolve back to junk food. What should i do? Thanks guys:)