Haven't been in class for 4 weeks and I don't know how to go back.

I'm in my first year of college in Programming. It's been really hard because i'm in a group where everyone was already in a friend circle and I'm not great at making friends so I'm basically alone in class. That and the fact that I'm really struggling with the class made me stop going. I haven't gone in 4 weeks and I want to go back but I'm afraid I'll be left behind too much. I have a lot of trouble studying and getting anything done so I'm really Lost with what I should do.