Hi Dingoroo, yes it is completely possible that you had no recollection of this childhood abuse at all. And I know it is terrifying how our minds can hide stuff from us. I have a dissociation disorder and was so freaked when a memory of a whole chunk of my life came back that I could not remember.
BUT, I try not to be scared by my mind in that way because I think it is just blocking things out or whatever to help me cope.
Oh and yes, it would be great if you saw a therapist or something IF you are ready to go and cooperate. Personally, I think numbing is quite a good coping method and I do it often. But, if this is holding you back in anyway, try and get some help or change it. I am sorry you went through such hard times (((Dingoroo))).
Oh and yes, the violent work from school etc. ARE signs of childhood abuse. I am sorry if you ever did go through this, it is totally unfair. But don't blow everything out of proportion in your mind yet. Seek help if you want and then slowly you can try and get memories back IF you want to. Don't think that every blank part of your memory is from something bad, that is not necessarily true.
Take care and sorry if i rambled!