Social Anxiety

I'm at University and I used to be able to social more often, cause I was living at Unihall (A whole lot of students chucked together for their first year), but since I've been living with my partner, studying and working, my social life has gone to shit. I'm naturally a introvert (or a ambivert) and have no clue on have to be social or how to get into a friend group... I have panic attacks and can't seem to get over the idea that I'm not smart enough to be talked to (I know it's not true, but it still gets me). Help?