Not excited, depressed.

Been having a rough pregnancy due to my child's father and I don't feel excited for this baby. I feel bad but I don't. I'm nearly 6 months. Some days I feel like giving the baby up for adoption once born. I feel terrible about that but can't help it. I'd be hard for me to give the baby up but at the same time not sure I'm ready to be a mom again. What can I do to make myself feel better? No one understands me.