GO!! !! !! !! You only have one high school graduation. If you don't attend the closure of your high school career, you can never truly have closure over the things, both good and bad, that happened there. I also considered not attending mine, for the same reasons as you have stated... but I went anyway, for the reasons I have just stated. Result: I am a completely different person than I was in high school. I am much more outgoing, sociable, and overall successful than I was in high school. Why? BECAUSE I PUT THAT BS BEHIND ME. I still talk to all of one person from my high school. Seriously... it's a whole new world after high school. But you will only experience it if you can CLOSE your high school career properly.
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Not my chair, not my problem, that's what I say.