I was in a similarish situation in highschool - I enrolled in a new school at the start of year 11. All I can say is that you likely will find some people you can talk to - it took me quite a while to adjust as well. Participating in activities/events run during or after school might help you, or otherwise approaching someone to work with/help you on something for a class (or event, or really anything you think might be good). Don't feel bad if you don't really click with someone after chatting with them a bit. It's a pretty random process before you find people you can actually connect to. I've been in uni for two years and while I had friends, I didn't really get a 'group' til the latter half of this year. This mightn't apply to you but a lot of subjects will have students working on things outside of class time (during lunch, after school etc) - especially when they have projects for things like art or industrial art. This holds true for a lot of subjects, but in different ways. It's something which depends on the school environment itself. It's a bit hard to give you more helpful advice and I wish I could, but at the end of the day it's just about finding where those people are to be found, which usually means looking into places/things you'd want to be involved in. Or - the good ol' desk partner technique. If you can get along with them, maybe ask if they'd mind you sitting with them/introducing you to their friends, if you feel up to it. Getting a bit out of your comfort zone might help you, but I realise you might not want to push yourself too far.
You probably won't find your bff straight away but it's okay if you take a bit of time being able to find your people. At the end of the day, bearing in mind that find new friendships and building them up takes time, and not pushing yourself to be around people you don't feel connected to out of obligation, are important. idk if this is even helpful, but I hope it is.