coming back from a bad past?

I lived a really bad life before. Partying all the time and having casual sex, cheated on my partner, smoked weed, and lied up and down about a lot of things. I have grown up a lot since then but I am finding it hard to forgive myself. I am about to be a mother and I am so scared about not being a good enough person because of my past. I am genuinely sorry to all those I hurt in my past and I have prayed for forgiveness. I just want to be a good mom. What advice can you give me to help my partner understand that I have changed and to help me forgive myself?