Hey,
You are a very young person and you haven't missed out on anything and you have many many years left to experience everything.
Believe me, I've felt the same at your age and went to two universities and only later I experienced everything.
You could join clubs, societies, group starting small, introducing yourself etc if you want.
Focus on your stories, future, partake in your hobbies. Do what makes you happy. Be kind to yourself.