I have done the same as Shimmerz, apologizing to my own children for the times I have let them down. They each should know that they can come to me with anything and trust me. I do not deny my own wrong doings, and I never did even before I realized I have all these trauma issues and PTSD. Because my own childhood was ruined by an overbearing woman, my mother, who never accepts responsibility for her own wrong doings (it's always someone else's fault), and she has banished us all at one time or another, me as recently as two weeks ago. That is the very last time she gets a chance to abuse me, for I am done forever making myself vulnerable to her. It had been about ten years since I had seen that kind of abuse heaped in my direction, and I was wrong for thinking that at her advanced age, she had mellowed. She hasn't mellowed, and neither have my abusive siblings. I am done. I will likely never even be informed when she dies. I am a little sad ,but that's okay. A little sad is better than traumatized one more time at her hands.
As someone else noted, parents are people too. People come in all different varieties, including abusers and those who deny their own culpability in the wrongs their children have suffered. Some parents are really great, but most are going to fall somewhere in between the two poles.
Also noted earlier in the thread is that you are now in control, and you need not tolerate anything less than complete respect. If your mother is going to continue to deny that your reality is real, you can either break away from her completely if it hurts you that much (a perfectly acceptable decision, in my opinion, and one I wish I had chosen or stuck to myself), or you can limit your interactions with her to "how's the weather" and keep it really light.
I feel for you, because I've heard so much of that same type of criticism--I'm overreacting; I'm too sensitive (funny, those who say that just love it when I am sensitive toward them and what ails them; it's called empathy); I live in the past, and so on and so forth. Too many people want you to sweep it all under the carpet to save them from an uncomfortable position of cognitive dissonance or owning up to their own failures. It's not hard to apologize sincerely when you are a person who truly is sorry and are coming from a place of love. Some people will never get there.
Try to be gentle with yourself, because they're not going to.