You normally have to configure your router to direct inbound traffic on a listed port towards a certain machine.
Likely not if it isn't your config error but your ISP has done it. If they've given you a private IP like 10.*.*.* or 192.168.*.* then you are out of luck -- links have to be initiated from your home end. Likewise, if they've filtered inbound connects on their routers, you will have to get them to disable it for you.
You may not realize this request is rude. Post here, read here.
-- Robert