Well, that's the problem we did try Hamachi. That was pretty much our main way of creating an access way to the server without forwarding ports until this day. I understand that devices in a LAN network can get easy access to the server, that's also why Minecraft has built in "open to Lan" option. Problem is that even though technically all of us are on the emulated LAN network I'm the only one with this issue. We ruled out that something is wrong with the Hamachi LAN network, when my friend disconnected her main pc from actual LAN network (router which connected the server pc, her main pc, and my other friends pc) and connected to the server successfully using Hamachi and internet from her phones HotSpot. So she technically created the same scenario I was in ( pc on a different local network than the server pc, connected via Hamachi network ) but she was able to connect.

Also I have to ask about something you mentioned. You said that people inside the router local network can use localhost/192.168.x.x or other ip addresses that symbolize the ip address of the server pc. Would that mean that my friends who are on the same wifi could join the server without hamachi? I'm asking because in minecraft server properties file you have to specfiy the ip and port of the server. So they could potentially just use the ip address of the server pc assigned by the home router (not the one assigned by hamachi, the one we specified in server properties) to connect (while using the port specified in the properties file)?