Unfortunately yes. I trusted my friend. He bought. And now I can not get my 20 bitcoins. Unfortunately, I do not know anything about programming and illegal spaces. I just know it is deposited on a port called Tour and I can not do anything.
In order to withdraw from an exchange, all you need is your own wallet. No payment gateway, no mixer (unless you really want to), nothing special.
On the other hand, scammers tend to use big words here and there to confuse newbies.
That "port called Tour" sounds like TOR to me, your friend may have been using some service over darknet.
I suggest you get in touch with your friend and clarify what he has done there, but at first reading it sounds like you
may have been scammed. And 20 BTC is woah, a lot of money...