fraud! it is impossible to withdraw funds!

A girl from Tiktok wrote to me, then she asked me to switch to WhatsApp, and we continued to communicate there, then she said she was investing in some platform, and said I should also subscribe to it, I agreed to everything, and we invested together, a month later I already had $51998, and I wanted to withdraw $3,500, and the platform asked me to pay tax, I paid $1,050 tax, they didn't give me $3,500, they said illegal investments were found in my account, and I had to make a deposit of $5,198, I didn't have any money, I think this is a fraudulent platform and the deposit has not been made.
I do not know what to do, I want my money back.