going to a lifestyle club solo for the first time... tourist or participant

right so i've booked myself a ticket to a couples/singles night at a club in central london this saturday. i'm in my late twenties been chatting online for ages but never actually gone to a venue alone. my brain is doing the thing where it's asking am i going to look like a weird tourist sat at the bar nursing a g&t or do i actually have permission to play if i feel it. friend of mine who's in the scene said "just go and see what your body wants" which is lovely and unhelpful. anyone done their first solo club night recently and want to share what they wish they'd known... feeling brave and nervous in equal measure...