How to deal with doubts?

I’m a mom to be. But I’ve felt nothing but anger and pain throughout this pregnancy. I’ve always wanted to be a mom, always. This is what I want more than anything. But I don’t feel happy. I’m afraid that I will mess up, that I’d make the same mistakes my parents made. I already feel like a failure, I feel like I don’t have what it takes to be a good mom. I’ve always struggle with mood instability, anger, and depression. What happens if my baby sees the fuck up I am? I’m afraid of PPD, I’m afraid that I won’t give this child a chance to be connected with me. I know no parent is perfect, that you will fuck up, that you will have your bad days. This baby in me is everything I’ve ever wanted, but I don’t feel like I want this.

Any advice would be appreciated.