You need serious help.
You have a crush. You do not know him. You cannot talk to him.
A sea witch (The Little Mermaid reference) once recognized the importance of body language. So, if you cannot use words, use actions!
If you cannot use actions, then write him a note. Post it on his desk at school or wherever he usually is.
If you cannot write him a note, be patient. Wait for the right time to come to him. You can wait days, weeks, months, or even years!
If you cannot wait, enjoy your life around you. Forget about him. Live in the moment. Never dwell in the past.