Here's a question.....Why are you trying to access Facebook while at school? Shouldn't you be busy learning? Can't you live without it for a few hours until you get home again?
If you feel you can't, then it's time to have a good hard look at your priorities in life, and perhaps realise that you have an addiction problem. Yes...people can get addicted to technology, just the same as alcohol or drugs.
The "reward" you get out of seeing people react to your posts can be very powerful. At it's most basic, it's attention-getting, and you would be wise to ask yourself why you need to be connected to something like Facebook ALL day. Your world will not collapse if you don't have access to it for a while, I promise.
Try actually talking to people while at school, instead of texting everyone. Look them in the eye and connect that way. Give 'em a hug if they're your best friend. (possibly not if you're a guy, lol!)
Tell them they're awesome! Thank them for something that did for you. Talk!
At the end of the day, that connection will mean more than any emoticon ever can.
Make sure technology is your slave, not your master. :)