One of the few things I find to be an unrelenting pain in the ass about Discord as an unfamiliar user is account management - is my account tied to the server I

One of the few things I find to be an unrelenting pain in the ass about Discord as an unfamiliar user is account management - is my account tied to the server I've joined? Is it tied to my email? If I click a link to join a server and set a username, how do I link that with my existing account? If I set my username/profile picture on one server, does it change across all the servers I've joined? As a college student that's constantly told to join Discord servers for every class/club/friend group, it's so annoying for this not to work intuitively, and the Discord documentation isn't too helpful either. I think I must have joined about 6 different servers across 3 different email addresses by now just because of how obtuse it is.