You may never receive an actual Thin White Envelope or an email. One day your portal might just say 'Denied' in the little box that now says 'Candidate'. It is a pretty inglorious rejection, actually--considering the effort and the dreams attached to the application
USNA changed to the email process from snail mail to email about a year ago for at least two reasons. First, it provides faster notification. This way, people can immediately start focusing on alternatives. Second, BGOs often knew about planned TWEs before they were sent out and often notified the candidates in advance. In some cases, the TWE decision was changed before the letter went out . . . creating a mess. So, now the candidate knows right away and the notice is official . . . and final. I suppose they could f/u with snail mail, but to what end other than killing a few more trees?
As for the OP, there are still some possibilities, the most likely of which is NAPS/Foundation, which don't require noms.
Do not try to read the tea leaves in terms of why some people get TWEs or appointments earlier than others. I'm sure there is a method to the "madness," but only USNA Admissions knows what it is. IOW, just b/c someone in X state with or w/o a nom did or didn't get a TWE/appointment last week or last month or hasn't received one yet has no bearing on your situation.
