I want to share internet connection with external IP

Hello, guys.
I am running 2010 2.4GHz Mac Mini with 2GB RAM. My inernet cable goes directly to my Mac with no router whatsoever. Here's my problem:
I'm trying to set up a game server (Minecraft). So I need port 25565 to be opened. I managed to do that on my Mac and it's working perfectly. But now I want to host that server on my laptop (running Windows 7).
When I share my internet connection with that laptop and run the server and then check the port using canyouseeme.org I get message that that port is closed, connection refused.
After few hours of no results (adding Firewall rules, trying to port forward (before I see that port forwading can be done only using a router)) I call up my ISP and the guy tells me that when my Mac shares the internet connection, my laptop's IP is internal thus making the server that it's running invisible to others. My question is:
How do I share the Mac's connection via WiFi so that the laptop gets external (visible to the public) IP?
I really hope I made my problem clear.
Thanks.

Get a router.
The internet is a dangerous place for a computer without a properly configured firewall.
Also, when you get said router, look at the Logmein Hamachi VPN. It provides a point to point vpn connection which should resolve your minecraft issues.

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