Having a "crush" is very normal. Try to be a friend to this boy. Find commonalities like movies you both like. Also, you may wish to go http://www.AnnieFox.com to read how others your age handle the trials and tribulations of having a crush.
This is something that everyone will encounter, probably many time, over the course of school and life. What you do or don't do about it depends on the circumstance. Are you friends with this boy? Do you think he might like you back? If you're not sure, try hanging out with him as a friend and see if you get along. With that said, it's probably not a good idea to get too focused on one person at this age, although it can be hard to resist! Just remember to be confident in yourself and that things will work out the way they should.
just keep peeking at him dont i repeat dont look or stare at him really hard
give him a shy smile that will keep him going
then once he likes you just keep the same routine
tips: if he talks to you just talk little by little in a shy voice