Y’all I’m scared to have a baby.

My boyfriend is wanting kids later on but I don’t know how I feel about it.. I’m short and I’m really not looking forward to the stretch marks. I’m wanting to have a water birth as well, but he doesn’t. I want to do what’s best for my comfort zone and worst comes to worst I’ll have to go with another option. How am I supposed to mentally prepare? I’m wanting to start being active and getting in better health so I will have a healthy and smooth pregnancy and delivery. But then again the idea of being a mother scares the living day lights out of me and I don’t know why. I would love to have kids I just don’t know when.