I go to Youtube for mostly music nowadays, but I'd recommend these channels to anyone.
ATHLEAN-X
Doctor Mike
LegalEagle
MrBeast
Also, if you're a Sonic fan, look up EmuEmi's cover on Live and Learn.
Idk about finding friends as no one will really reach out to you to be friends with you. You'll have to be proactive in that regard.
Google "anime discord" and maybe one of those servers actually watch stuff together in the video chat.
Or you can start your own discord server (for free) and invite people who would be interested in watching stuff with you. Though, it's really difficult to match up timelines and schedules. For instance, I like to marathon my anime all at once. I also use Netflix. It would take some work, but hey, what hobbies are without work?