I've been debating making contact with several teachers who taught at my elementary school and with whom I have things to say. However, I'm not sure if I should. I guess I worry that I care too much since I'm 21 and elementary school was forever ago, but these memories keep bugging me.

The first group are the teachers who considered me stupid and treated me as such because I could recognize them or tell them apart (it was unknown at the time I had prosopagnosia). I've resented them for it for a long time. Despite my IQ test that my mom rubbed in their faces and my mom's constant support, I spent a lot of time growing up feeling I actually was stupid. They killed my confidence and I just never understood why they were so mean to me when, as teachers, they were supposed to be kind and supportive. I guess I want to tell them that I have prosopagnosia and how they failed at their jobs and made me feel awful, but they were wrong about me. I go to a hard university which is aiming to be tier 1, am double-majoring in Neuroscience and Applied Mathematics, am a Pre-Medicine student, and am an undergraduate researcher in an on-campus laboratory. Sort of a "ha, you tried to tear me down but couldn't hold me back"-kind of thing. I don't expect an apology from them.

The second, was my gym coach in elementary school and only refers to a very specific time. I was bullied by some kids one day at school and went to tell the coach who, of course, asked me who did it. I knew it was several of the boys but my darn prosopagnosia made it impossible for me to actually remember who. I was pretty certain they had blondish or light-brown hair but that characterized most of the boys in the class. I pointed out one whom I thought might have done it and, when the coach talked to him, he returned and said that the boy had told him that he hadn't done anything. Since I couldn't remember well enough to say with certainty he had actually done it, I tried pointing out a different boy in hopes that I would get it right that time. The coach got very angry at that point and told me that I shouldn't lie about things like that before storming off. I remember standing there, kind of frozen in shock, knowing that I wasn't lying and hating myself for being unable to do anything about it. I've always wanted to contact him now that I know my condition and explain the situation to him. That I wasn't lying. Maybe it's closure, but I'm worried he either won't remember or will think it's crazy I actually still care about such a thing.

What do you guys think? Should I contact them? I'm worried, particularly with the coach, that I don't have a lot of time to make this decision.

You could use it as a teaching lesson for them.
Why not a letter or email ?
It is so hard to remember everything with a face to face (confrontation??) to each of those teachers, and it was a long time ago.

You could write out all of this and let them know how it affected you, just because you had no diagnosis back then..
With a letter or email they will have time to think about it and soak it in- better for them to learn that way..

It might be worth it to write it all out , like you did here, just to get it off your chest, then let it sit awhile a decide if it really is worth sending it to them.