Yes, it is. Life is sometimes scary. And you know what? You can do your own life. The past can't be changed but you can change the future.
Each day is a present for you. You deserve it. You can work each day for you to get your goals.
Your children have a mother and this mother is you, only you, and ok,this mother is not perfect. Who is? What it really counts is the present.

My dad wasn't perfect but I love him and care of him. Ok. He made me damage in the past but what it really counts for me are the couple of serious conversations I had with him when I was old enough. He did the best he knew coping with his own issues but he told me that the best he has in his life are his son and daughters.

I hope you can find the same understanding in your children. I don't know what happened in the past but do you think is it possible to find some receptivity on their part? Is not necessary you reply here in public. Only think about it.
Some people are surprising. There, where you don't expect a positive reaction it can happen.