Is it possible that you could've accidentally deleted it? It could be a case. I'm not sure we'd be able to help here, though try contacting a member of staff about this, they will have more information about accounts than we can give here~
Good luck with regaining your account~
Try not to use someone else's thread when you need help, Heather, some people might not notice you need help because you didn't make a thread of your own~ Take into account what I said to Dakota and ask a member of staff about account issues, the only thing I can ask you to check is your email, make sure you have verified your account :3
Try contacting a member of staff about this, they will have more information about accounts than we can give here~