OMG! I did something today and I feel so embarrassed!

I was out at my local supermarket, I just had to buy some coleslaw, and saw someone I knew several aisles away and smilled and waved, she kinda smilled back and then I realised... she doesn`t know me! or rather she doesn`t know me as Me
she`s someone "he" used to know and talk to occassionally and I`m sure if asked she`d probably say "I haven`t seen him in a couple of years now, how is he?" she has no idea who I am though.

fortunately my ability to pass is virtually bombproof so I`v not outed myself, but now she probably thinks I`m some sort of Crazy lady

I`m sure there`s a lesson in there somewhere, so I`m sharing it just in case.
I guess after so long living full time it becomes Very easy to forget that anything`s actually changed, so consider it a Heads Up! xx