Disappointed in myself

Growing up I LOVED KIDS.. I was amazing with kids.. I'd have several people tell me what a great mother I'm going to be.. And I waited my whole life for this. Does anyone ever feel like motherhood is not what you expected it to be?? I feel like I've turned into this naggy, negative, (sleep deprived) human! It's awful..!!!! Any words of encouragement? Is this normal????