I need some advice

Okay so I'm an upcoming Junior, and I'm starting a new school where I don't really know anyone. (Last year I was homeschooled and my freshman year I went to a private school) I'm not as shy as I used to be, but it's hard for me to come out of my comfort zone and make new friends.

I was thinking about joining the track and field team, but I'm not that in shape. It sounds really fun though and like a great way to make friends. Any advice about the sport or just making new friends in general?