I have the same problem. The only workaround is to have you and your friends install Hamachi. In Hamachi, create a new network. Give it a decent name and password and tell your friends so they can add it to their own Hamachi connections. Then at the top of the window (next to the power button): right click>"copy ipv4 address". This is the ip you use in the Minecraft Client to login to your Minecraft server. It is also the ip your friends need to use.
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Hope this helps! Good Luck!
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