Being selectively social is completely fine. People often confuse being selectively social with anti-social, which aren't the same thing. Choosing to hang out around people you like is totally okay. Choosing to surround yourself with people you feel comfortable around is totally okay. There is absolutely nothing wrong with being selectively social. But if you WANT to break through your silence around others, it's always a lot easier said than done.
As for making new friends and meeting new people, it will be a bit hard getting started. But what you can try to do is first find one or two people who you're friendly acquaintances with, maybe people who are in your class/classes. Try to smile at them if you pass them by in the hallways. Try to open doors for them. Once you feel like, hey, I can do this, ask them simple things about maybe homework or if you're feeling extra courageous, ask them something about a show or movie you both watch. Finding common topics or interests is an important first step. From there on, you'll have more things to talk about and the more you talk, the more you'll know about these new people.
I had some trouble making new friends when I moved and it was hard for the first two years but then someone told me a quote; "Life begins at the end of your comfort zone."
I wish you all the best with breaking out of your shell, meeting new people, making new friends and being happy with who you are! Good luck friend!
