I agree with wad most people say here... Go approach that girl
lor.
I know it's harder said than done pal. But, friend, juz wanna let
you know that I'm just as shy as you also.
But when you approach a girl, don't give any expectations for
yourself.
Don't expect too much in return. Juz go and make frens.
Then guard your heart, don't let it fall into an emotional
trap.
That's all. I manage to get rid of my shyness after that.

Good luck bro...