I miss being happy.

I don't know where to start. I love my daughter to death. She's a week old today and I don't know if I'm just overwhelmed of being a new mom, or there's something wrong with me. I'm just not happy, I feel like literally sad and down all the time. A part of me wishes I was still pregnant and I feel terrible about it because she's the world to me. I just have no motivation to do anything. I want to stay in bed and sleep all day, and be left alone. I'm so tired of everyone giving their opinion and showing up everyday and want to be here for hours while I'm exhausted. breastfeeding has been a roller coaster, she either latches on right  away or she screams, or just uses me as a pacifier and I have no idea if she's even eating and I just wanna cry. There's moments where I just lay in bed and cry. I want to be happy, I want to enjoy being a mother and I can't, will this go away with time? How can I feel like myself again?