How come i cant log in as my usual name " kirman " I has any1 had this problem b4 ?

When i try and log in i get this message

Kirman, you do not have permission to access this page. This could be due to one of several reasons:

Your user account may not have sufficient privileges to access this page. Are you trying to edit someone else's post, access administrative features or some other privileged system?
If you are trying to post, the administrator may have disabled your account, or it may be awaiting activation.
Any ideas ? oh and i havent done anything wrong so if im band id love to know why... this is annoying

HELP! PLEASEEEE!