Why does my love feel so cold for my daughter?

Why can’t I find the attachment and love for my 1 year old daughter? I grew up feeling unattached from my own mother who was a very good mother but lacked emotional support and even saying the words “I love you” to her own kids. I swore I would be much more loving than she is to my kids, especially my daughters. And now that I have a daughter of my own, I can’t seem to feel anything. I do everything for her to be taken care of. I like to think that I’m slightly a good mother. And I say slightly because the guilt of feeling unattached to my daughter is in the way. For so long I thought it was postpartum depression but this feels like it’s going to last forever. I break down about it every now and then. But I’ve been thinking about it more often since my husband mentioned it. He’s such a loving husband and father, he’s always worried about me but this time he told me how he’s worried about me AND baby #2 on the way. And it made me think. I fell into deep depression after I had my daughter and it lasted 3 months. All I wanted to do was hide and cry my eyes out. I didn’t express my feelings to anyone. No one around me would understand the way I felt. No words to describe it. But everyone notices that I have no bond with my daughter. As much as I am so excited to be pregnant again. I’m afraid for my next child. My husband recommended I see a therapist but I know when the times comes, I won’t be able to express myself with all honesty. Everyday, I feel like a terrible mom and I just want this feeling to be over with.