Honestly, you’re just starting out. Enjoy the summer, the beginning of high school, look for new and healthy friendships! If you really want to get a head start (and I’m proud of you for doing so) just start thinking of what you find interesting. Then join a few extracurriculars related to that. Be good and passionate about what you do. Try your hardest at school. If you’re looking for a top 20 university, straight A’s is a major factor. Good luck!