Well... I discovered that you could add a non #Google account as an alternate #email address to a Google account. I wanted to do that, but as I attempted to do that, I wasn't allowed to do so because apparently that (non-Google) email address of mine has already been associated to a different Google account. Idk anything about this, at all, and there doesn't seem to be a way to either 1) disassociate this email address of mine from wtv Google account that is, mine or not, and 2) find out what Google account is associated with my personal (non-Google) email. Fucking hell, Google.