OMG, what do I doo!!!!!?

Alright so I have been liking this one guy for three years now. In my past questions, theres one all about history. Basic line i never talked to him before except prank calling a few years ago, which i hope he forgot about it. Me and my friend usually follow him after 1st period, and I get to the point of walking right behind him or next to him, but i cant talk to him. i get so nervous where i start shaking!!! HELP!!!!!! and i dont wanna bump into him he might think im a klutz and besides theres a lot of people passing by, so that wouldnt me good... I already know what I'm going to say, its just omg i cant talk to him.