How can I manage my postpartum depression?

I’ve never had postpartum depression before, and after having my daughter, I have it… I don’t know how to deal with it. I need some advice because I feel like everything I do is not good enough for my children. I have times where I want to be alone in my room and don’t want to come out. I basically shut the world out and want to be alone… I love my family so much. My children are my world!!