Am I normal or not?

I had my baby girl 8days ago, and as much as I love her too pieces and she's the most beautiful little lady in the world. I cannot help but be so down. She's my first baby, I constantly think what if I can't cope. What do I do. I can't do this. How do other people do it. I don't know why I'm thinking like this but I feel so shit about my life changing. Feel like a lot of pressure to bring up this little person! I don't know whether it's because my mum passed away when I was 18 weeks pregnant and now all the greif is coming out. But why am I feeling like this!!!!! I just want to be happy and get on with life but I feel like this is it now. That I'll never have time do anything anymore. Constantly checking the time for feeds. Need reassurance :(