I feel like a horrible mom...

My baby is just over a week old and I feel like I’m failing in every way as a mom. I wanna do so much better but I don’t know how.. she’s my world and I love her so much. I sleep maybe 4 hours a night, my husband try’s to help me but it’s mainly only when it’s about to be day light. I just feel so alone; but with her. Like the world had ended and it’s just us against the world.