Jessica, so totally normal I reckon. I did it too, so much so that when my ob told me I ws in labour and having a baby that day (I was in denial), I flipped. Not only was I having a baby it was MY baby. For weeks I waited for the proper mother to come and collect her lol.
Now as I sit here typing, it is with one hand. In the other is my almost 2 year old sick child. I can't remember what my life was before her and I certainly don't long for it. I am (was) the most inflexible person I knew - thanks to a lovely dose of OCD. A small pink bundle helped to heal some of that and right now I am the most chilled I've ever been. She's taught me more about me and my DH than I ever thought possible and suddenly my old expectations of things seem different.
Don't get me wrong, I had some bad bad days with her. It is hard learning your new job. Like walking into an office where no one has done that job before and can't show you - you just have to make it up.
You'll find your groove and you'll be fantastic and you have many hundreds of supporters on here when you do need a cheer.