Has anyone else gone through anything like this?

So I'm in my first year of college for the second time and I'm failing again due to absence. My brother emigrated back in October and is my best friend, the only person that would always be there for me. Because he was going I started to blow off class to spend as much time with him and when he left I was still pretty tore up. Attendance is only mandatory in some of my classes but after he left I couldn't bare going into my classes and seeing people I didn't know in fear that they'd think I'm weird. I couldn't handle all the social groups and me being isolated. I constantly kept up with the materials but now I'm failing because I haven't attended class. Because of all this I've been experiencing severe panic attacks and it has gotten to a point where I feel terrified leaving my room. I still call over to my friends from back home who live in the same city 2 or 3 times a week but it's become increasingly harder. I sit there idly just so I can be around people but I've become noticeably distant. I'm just so so scared and don't know how to fix thing with college or tell my parents or be able to be normal even with my friends. I really need advice