I made my account last time the sign ups where available and played on the PBE server for a few weeks then I try to get on to test out Quin but can't log on. I try to recover my username to see if I was using a wrong one or something, but none of my emails work for it either.... Why would my account just disappear?

Nope, when the sign ups were opened at that time[1] - they were not expected to be opened, it appeared to be an issue and all accounts created during that time[1] were deleted.

[1] A date slightly before the MAC release. PBE sign ups were unofficially opened for some reason and went offline few hours later. That was before announcing the League of legends MAC version.

It's all good. The servers were down which made it say that I had no account but im logged on now