Cannot access myself with global ip, others can
Solution 1:
Look in your router settings for a feature called hairpin NAT or NAT loopback.
In most routers, port forwardings only work from the outside by default, since the actual address translation (NAT) is also done only when packets exit or enter your LAN, not inside the LAN. Enabling NAT loopback should make the forwardings work from the inside too.