From my experience alone, I can tell you college is so much better than high school, especially if you have social anxiety.
Let me list some reasons:
1) Bathrooms - You don’t need to ask your professors to go to the bathroom.
2) Introversion - You don’t need to make friends. For my first two years of college I was putting myself down because I didn’t/couldn’t make friends with anyone (not that I actually tried very hard). Then I realized, I was okay with that. It was also that time when I discovered my love of books and found a lovely spot in my library that faced my campus’ garden and I felt happy. I could do what I want, eat what I want, and not worry about needing someone else’s company because I was happy.
3) Email - Professors are more open to answering things on email than high school teachers are. I was never the guy to raise my hand and ask questions but with email, those things are easier.
4) Clubs - I’m going to be honest with you, I have never been to a college club and wouldn’t know how to find them in my college if I had to but maybe you can find people have who have the same interest as you and that would be the icebreaker/similar interest and you can make friends like that.
5) Self-reliant - For me being alone means I am self-reliant. I don’t have any friends to lean on or help me and I have to work harder and be better. That may sound rough but it will make you better. For me when my back is against the wall and it’s all on me I improve. Like I said my first 2 semesters I was down on myself for not having friends but then I embraced it and attacked school and getting good grades and I jumped my grade from a C to an A.
All in all, my college experience is leaps and bounds better than my high school experience. And hey if you ever need help or anything you can just send me an ask or something. Also I cannot recommend this book more read: Quiet: The Power of Introverts in a World That Can’t Stop Talking by Susan Cain, that book changed my life and changed how I see myself in context of the world around me.