OMG! I am mortified!

    I recently got a piano after years and years of NOT playing. Well, as a youngster, I  was so proud that the first original piece I REALLY mastered was  Beethoven's Sonota No. 14 in C # Minor (popularly known as Moonlight) I had this bad boy committed to memory and could play it on cue many years later after not touching a piano.  I played it yesterday and got stuck, so I decided to download the music. When I downloaded it, I was MAD as hell cause I thought the site had the music in the wrong key.  Imagine my horror as I discovered, it wasn't in the wrong key..... after all this time  I AM!  I'm horrified!!!! I have no idea how long I've played this piece in the wrong key....can I blame this on MS?  :o)