My friends use my money from our joint vacation account to gamble, is it wrong to want my money back?
I think you're in the right to want your money back. Are you going to ask them for the money to be returned?
No, I'm going to simply withdraw all my money and leave the account.
It is fine to want your money back when you begin to stop trusting your friends. You should communicate with them instead of just taking the money and running!
It's not a matter of trust anymore. They are becoming irresponsible and fiscally unstable. I don't care if they lose it all, I just want my money back.
I know you're in a really tricky situation right now. But I still highly recommend you communicate this with them instead of just running away with the money. This could cause more issues for you down the line.