I am afraid to go clubbing with my crush?

So my crush/best friend wants to go to a club for his birthday. He has a lot of friends and I am more of the anti-social type. I think something is going on with him and I. We massage each other all the time, and we flirt. I am unexperienced and I have never gone to a club. He wants to do coke on his birthday and go clubbing with all of his friends. I am scared that if i go i will see him draped over some girl. Or that his other girlfriends will not like me, because I am sure they like him too. I know I am special to him and he said I have to go that there is no excuses. "It is mandatory," but I am scared I will see a different side of him. Should I not go?
I am afraid to go clubbing with my crush?
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