I Just Really Am Looking For Some Sort Of Advice...

Okay, I am trying again because my last post didn't really get seen and I am running out of time to act.
To try to make this a little quicker there's this guy who I have been head over heals for for months now. Obviously there are only a few days left of school and I don't know what to do. I want to tell him on the very last day of school that I like him but I don't want to look stupid. (I have more backstory on my previous post about the whole situation) but anyways I have a slight feeling he might like me back but I am not positive. My friends all think I have a shot but I just don't know. I have never done anything like this before and I don't know what to say or when to say it. I share a class with him and I don't really want to catch him after class and tell him I like him and him be with his friend(s). I just don't know. I also don't want to miss an opportunity like this just in case he does feel the same way. I also don't know how fast the word would get spread if he rejects me. Next year would be a living hell for me.
I just please would really like some advice. Any. If you need me to answer any questions about the situation to give anyone a clearer picture I can. I am a pretty fast responder. And I know this rant isn't really the most important, at least not like other peoples situations on this, but I- this is been bugging me so incredibly bad. Please help.