One idea is to practice being away from home. It's like when you were learning how to ride a bike and you started out using training wheels. Try spending the afternoon at a friend's house before you stay for the whole night. Or go to a summer day camp before you decide to try sleepaway camp.
These shorter trips can help you feel more confident and comfortable. You can learn to feel less homesick. We really hope you do. Why? So you don't miss out on all those adventures waiting for you!