It's not a matter of not wanting to remember or pushing aside that memory however - remembering a feeling of pain to it's exact amount is practically impossible. You might remember certain sensations regarding the pain, like smells or visual sights, but generating the same feelings are impossible even if you remember how much pain you were in.

Like, getting a paper cut. You know it hurt when you got it, but remembering exactly how you felt is impossible. All you remember is that there was pain involved in it, so you would naturally want to avoid getting cut again.