Hmm well I have repressed a few things, ie refused to deal with or accept them. Not anything particularly devious etc, just more about my roots...which are all withered and well dodgy.
One option is to get hypnotised, they find out the 'root cause' of the memory and then they either help you deal with it or just plain stop you from thinking about it/remove it. I forget.
I've had a few 'narrative wreckages'. Latest was my nan saying I look a lot like my father...I look nothing like the father I think is my father. This, and a few other things really mess with my head...even though no one ever asks me about my parents etc.
Anyway, try hypnosis. Or CBT. Or if its not affecting your social life, your education, or your relationships then I spose you could leave it.