How to deal with a crush 5 years ago?

Ok so way back when I was 13 , years ago I had a crush on this guy who was a year older I was dumb and stupid and one day decided to get my friend to send a letter to him saying 'my friend likes you' and that's it lol haaa haa (quite funny lookig back on it) anways ever since that when I was 13 the guy must of told his friends and I would get stares from him and his friends and they would huddle together and talk about me and giggle and stuff and puposly run into us and stand right infront of me, Anways 5 years later it still goes on!!! I was at work the other day and served to of his friends and they started to crack up it was so embarssing :( lol