I found a small packet of white stuff in a clear plastic bag in a nightclub

Looking at it closely it doesn't look fluffy like cocaine...

I snorted a little amount last night but I had drank 15 pints already so I didn't really notice anything, and I remember I got quite a bit on my face and it tasted a bit bitter... like mdma maybe.

people were definitely doing drugs at the club so I think its an illegal drug

How can I work out what it is?... ideally quickly

the packet is really quite small too and not clumped up like I've seen cocaine being before.