undecided on children

I'm quickly approaching 32 years old and I am still undecided. Sometimes it's all I think about for weeks at a time. I have some mental illness in my family that scares me, my partner has two kids and he doesn't want anymore and I don't always enjoy being around children. But I do think I would enjoy motherhood. Experiencing pregnancy, having a baby to care for then a son or daughter to have a life long relationship with. I am stable emotionally and financially and feel like I am ready to make the sacrifices required when you become a parent. But, for some reason I just can't decide if it's what I really want. If you were undecided and then had children or committed to not having children, how did you finally decide one way or another? Do you have any regrets or would you change the path you took in any way? Thanks in advance :)