While reading this post I felt like I was reading about myself, except the aroace part. I too only had 4 friends till now, nobody wanted to be friends with the fat guy and COVID didn't help the situation. But after everything was returning back to normalcy I felt like I was missing out on life. Spent a few days depressed but then decided to change it. I started small by talking to a few of my classmates, joining them for lunch breaks, and played a few online games. I didn't connect with everyone but I found I have a lot of things common with some of them and started to hangout more. I wouldn't call them my best friends(they are the original 4) but we hang out more and ask to join them whenever they have plans. So I suggest don't be shy, there is no loss in trying just go out and talk with people. I wish you all the best.