Yes I have NAT and router in my ADSL modem after all so I'm now asking you how I tweak my NAT so that I can turn it off and still data moves.

Because if I turn NAT off (what is only option to it what I have found) any kind of data won't move to any direction.

And I didn't find any kind of help to this from these sites so now I'm asking from you how I can turn my NAT off so that data still moves and so I can host source forts servers and someone actually can join to them? And also do I have to tweak my router too what is in my adsl modem?

PS. If you didn't know NAT prevents people to join to your adsl and so you aren't so vulnerable to hackers and other attacks.

Or do I just have to buy new ADSL modem where isn't that NAT or firewall or router?

You need to find the port forwarding options, and forward ports 27000-27030 to the IP address of the computer you're running the server on.

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"If they rape and kill me, I hope they kill me first. That way, I sort of win."

Well those are open and still I can't see my server at the list. Even I shut down my firewall.

I'm pretty sure that my NAT won't let my server get any data.