If you're really worried about living by yourself, then ask your parents to let you help them with chores around the house, like cooking and cleaning, so that you can learn how to do them. That's what I'm going to be doing next summer. (I'm too busy with work atm. Doing some cooking this summer though)
Like others have said though, you won't be the only one at uni who can't cook or clean. Apparently loads of people go to uni without knowing how to do any house chores at all. But you'll have plenty of time to practice while you're at uni, and most chores are pretty easy. (though I guess I have a slight advantage because my parents made me do loads of chores when I was a kid xD)