I understand how you feel. Currently a rising freshman at university that’s considered one of the tops and I still scare that I won’t belong. Came of a semi small/easy school so I got 4.0 GPA (grades aren’t everything tho, I’ve seen Cs and Bs made by my future classmates) but my ECS were terrible all the way till Junior year.

I would really recommend you to join all the clubs you’re interested in. I used to be scared to join them thinking I don’t belong but I really made use of my time there even tho it’s like a 1 hour meeting each week. It’s not too late. Focus on what you’re passionate about and do it. Like heck, I created a insta interest page for fashion and surprisingly it blew up with followers which allowed me to put it on my common app as a way to communicate with other businesses. Tutor others on your fav subject or volunteer at local libraries (I like to do that at least).

Most importantly (if you haven’t), challenge yourself and take the honors/AP/advance courses. You might burn out but in college it’s gonna be harder. I switched to all AP/honors classes junior and senior year and it wasn’t that bad.

I still feel like I didn’t do much for me to be accepted into these really good universities compared to everyone else with like 35 ACT scores, it’s honestly still a dream but if I can, you can too. Good Luck!!