Fears about motherhood?

People always talk about how excited they are for the future and to have kids which I am too but am I the only one that has major fears about it too? 
Like one of my biggest fears is that once I become a mom I will loose myself. Like I'll be one of those moms who's kids are their whole world and they no longer have friends out side of play dates and they don't do the stuff they love anymore. That's terrifying to me. 
Do you ladies have fears? What are they?