Thoughts & Views Wanted Please

If there was one time i wish more of my friends read my journal it's this one.  I've got a situation that I'd really love to get a variety of feedback on. I'll warn though this may make me sound so darn stupid I tell ya.  I'm kicking myself for this. I went to do my Wed a.m. at the cat shelter.  I parked the car & me & the woman I work with were walking to the front door, chatting away abt stuff.  We each had something to mail & when we got to the mail box dropped our items in. I must of been in la la land cause I didn't realize till sometime this afternoon that I forgot to put a stamp on it, DARN IT ALL!!!!!!!.  I've got my return address sticker on it & Canada Post told me that the norm will be to send it back to me seem as my address is on it & not to go ahead & forward it on & make the other person pay the postage. Here's the clincher, it's a birthday card for my friend of abt 30 yrs, Marie.  She gradually became a bit distant fr me after I no longer worked, two different worlds now I guess, but the friendship is still there. If this is the one chance they'll forward it on, how am I going to face her.  I feel so darn stupid.  Do I tell a white lie to save face & say something like "well I'll be, I know there was a stamp on there, shows how well that held" (in yrs past Canada did have trouble with stamps staying on).  Or do I fess up & hide my embarrassment any way I can. Man am I too sensitive or what!!!!!