Stressing over friends birthday party?

Ok so I am sick to my stomach because I really dont want to go to one of my best friend's birthday party already happening saturday. First of all, hes having like 10 people there that I dont know to play hockey...one of my favorite sports but also baseball. Both I really dont want to do becuase i'm not as good as the kids he is inviting, and i'm very shy in situations like this. The biggest reason is because of this a*shole pr*ck he is inviting that kept prank calling me about a month ago. I know there only prank calls, but this kid I have never seen before in my life and he was making fun of me in the calls. He also kept laughing because it was making my very angry and I was showing it over the phone. So I feel like he "mostly" is ruining this for me. But it gets worse, hes one of like 5 or 6 maybe more sleeping over there. I really dont want to deal with him over night but i am being forced to sleep over by my parents. I made them aware of him being there but they are still making me becuase i never sleep over there and my friend always sleeps at my house. I usually have trouble sleeping at friends houses, it just not comfortable. But my parents are making me so I dont look like a loser. So they really are helping me butits still very stressing because I dont want to be there playing sports with kids I dont know and embarrasing myself, and mostly I dont want to see that d*ckheads face. What can I do, please any advice possible...