Well, let's face it, kids in high school are pretty stupid, especially when they try to impress each other. I don't attend my reunions and don't really speak to too many old time friends. One is now my sister-in-law and we rarely talk, not even comment on FB. I see some of the others at family get togethers, as we have nieces and nephews in common, but other than that, we really don't stay in contact at this point.
I agree with the others, why go, if you had nothing in common with them back then. Do you feel it would be of importance to you?
I have photographed a few of reunions. The HS reunions seem to still be cliquish and the one 40 year frat college reunion they all seemed to keep in touch with one another and really did enjoy each other.
Unless you have a good reason to go, like you would like to visit with a number of your girlfriends, I would not go. Chances are you are not going to rekindle any old relationships there.