Some musicians from my high school are performing somewhere in a few days, and I am the guitarist of one of the performing groups. We have a rehearsal today at the house of the bassist of the group, and I am very nervous about going there. I don't have friends, so I am not used to visiting people from school. In this case, it's actually two people from school (his brother has been in a couple of my classes). And I don't feel quite prepared for the social interactions that would be involved in visiting today. 

Does anyone know how I can feel less nervous about this?