The point here isn't "what you do". You can carry a sherman tank in your pocket for all I care. It also doesn't matter what you did when "you were in school", especially if you were in school over 30 years ago like me.
The point here is to check the rules and regulations at the school you are looking to go about "armed" at. Face it, MOST schools these days are going to consider that a weapon and will have rules about them. Asking on a BBS isn't going to get you an answer, only opinions, unless one of the board members from your school are present here.
It seems to me that the OP is thinking it might NOT be ok to carry this knife at school and is looking some sort of validation to do so. Even if a couple hundred of us thinks it is ok to carry it, it won't stop them from kicking you out of school if it IS against their rules.
But hey, it's your choice.