Actually, you do need to loopback in any source if you're using your public IP.
Firstly, follow this tutorial to install
Microsoft Loopback Adapter
Microsoft Loopback Adapter Installation Link
After, follow these easy steps :
1. Head to :
Control Panel > Network and Internet > Network and Sharing Center > Change Adapter Settings.
Attachment 111271
2. Right click and choose properties. When the tab is open, choose TCP / iPV4 and select properties.
Attachment 111272
3. Paste your public IP in the red area.
Attachment 111273
4. Connect to your server!
Hope I helped and of course, have a nice day!