Stay calm, it's is normal that nobody else can't access your zone.
You can connect to the server because it runs on your own computer. Someone from outside has to go through several systems to get to your computer (specifically; your router / firewall). Usually one of those systems deny access so the route to your computer is denied as a whole.
In order to configure your router I need to know if you have a router, if you can forward ports with it, if it has a firewall and if it's on.
Last but not least, do you have a firewall at your own computer ?
If you can answer most of the questions about your router 'yes', please read this topic on how to configure your router.
Keep in mind that not a single router is the same so you might have to look things up in the manual of your router.
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