I just thought for a second that you were afraid of looking into mirrors.
Anyway, ontopic, I don't really look back myself. The only times I do is when I'm sad.
I don't know if I hate looking back, but I guess I do, since I only do it at these times.
All my memories in the past, which are mostly bad memories from school-time, just brings back the reality if I think about it in an everyday situation, and I get very anxious about alot of things, because I don't want to make the same mistakes that I've done before.
And as you can guess, this just adds up as stress, and I think it's bad enough already.
So no, I believe I've blocked myself from reviewing the past to protect me. Sometimes I really feel like breaking down because of all of this, but then again, this world is all about survival in the end. :/
EDIT: Maybe I should mention that I have not been diagnosed, yet, and I can understand that you want to shut all this away, cause this is probably what you experienced in the past.