How can I start?

Ok so I’m going to this new school you know I don’t know anybody!!! Here’s the thing, I can be a pretty cool girl sometimes, but I guess I’m pretty shy and I don’t know how to make good friends. See I don’t want to be the girl that has no partner in a class, and I don’t want to be the girl that has everything handed to her. Of course who doesn’t want to be popular but I want to be a girl who most people get along with. I don’t want to make fun of people like a lot of popular kids do, I don’t want to do drugs, but I want to fit in, have fun, and be happy! I haven’t had good luck with having fun and happiness because of serious family issues, but I want to try and get out of that. So when I walk into my first class, how do I make friends? You’ll prob say oh just have confidence be nice and say hey, but deep down you know that you prob wouldn’t do that and they’ll just look at you funny especially if they’re talking in a group or two people. So do I just talk out loud when the teacher asks questions and then start a convo like that? Where am I gonna sit, and don’t say just go sit somewhere you know that’d be weird. Where’d I sit if I haven’t made any friendships yet? yes I am gonna join gymnastics next year at this school, but im not gonna sit with them the first day you know, so wbu please give me advice, I think this would help a whole bunch of people!