Finding the right guild can be a tough and sometimes long process, but once you do I assure you, there is still plenty of social interaction in the end game. But that’s the catch. Making friends at end game. At some point in the last few expansions there was a dynamic shift away from leveling being a meaningful part of the game over the content available at max level.
Especially with the bonus XP event going on right now, most people you see leveling are veteran players that are leveling alts and are in a race to get to max level. These people by and large have no interest in social interaction at lower levels because the faster they get to 120, the faster they can start participating in raids, dungeons, and pvp at 120.
In the meantime I would suggest trying to find a guild specifically labelled as social, or new and returning player friendly. The revamped guild finder tool in game has largely been a success in directing people to guilds that fit their needs, and there is also a thread in the new player forums for friendly guilds willing to take on new players. That can be found here:
Aside from all of that, if you’re just not feeling the way wow currently is, your subscription also grants you access to WoW Classic, which is currently the game as it was in 2006. It almost sounds like that might be more up your alley.
That’s all the advice I can really offer though in lieu of providing specific questions you might have for us to answer. If you do run into trouble with something please always feel free to post it up in these forums. Trolling is very minimal, and the regulars here always do our best to provide a solution for posters.
Best of luck out there!