First of all, try and relax! You'll have to spend the next little while re-training yourself, you're now in a safe and permissive space. Grab a drink, approach others and have a conversation, Everyone here is in attendance for the same reason, to meet new like minded people!
Unlike a vanilla establishment, the other guests are here to have a conversation, meet new people and form new connections, but in order to form those new connections you have to talk with others, don't be afraid to start a conversation!