I honestly don't understand how people socialise and make friends though gaming
yet I've never interacted with anyone, I don't have a headset and I don't wanna hear voice or chat while playing though
To be blunt, you need to interact and talk with people to form a lasting relationship. If you aren't socialising while gaming then, well, you aren't socialising while gaming.
That's fine, a perfectly valid way to play, but if you really envy them and you want to start socialising and making friends while gaming you're gonna have to get a headset and talk with people.