I think you should go across that stage, Space. If nothing else, because of what that represents - the fact that you have finished something that not many people do. And while those last four years may have been painful for you, you grit your teeth, fought through it, and made it to the other side.
And the fact that you did it with honors is no small feat! You don't do that by just putting in the bare minimum! It must have meant something to you.
If nothing else, you're telling everyone "I'm done with this crap, and I don't have to deal with you anymore."
Do it for yourself.
PS - Never went to any of my formals in High School either.
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"Give me a long enough lever and a place to stand and I will move the earth"-Archimedes
"We will find a way or make one."-Hannibal
"Perception is reality - which is why I try really hard to see the good in things."-Me