I'm not sure if I have just been scammed or what.... But I just sold 5 BTC for $3870.52

HOWEVER....

I had to sign up for a Venmo account just to get paid. The guy claimed that's all he had... so I signed up. Now I'm stuck with this shit and my bank isn't allowed for a Venmo "Cashout".

Any help would be appreciated. IDK where to begin or where to attempt to even recover my money.