Women: do you ever get scared your partner will leave you, and you’ll be left alone?

!! DISCLAIMER, I’m sorry if this is offensive at all, I’m genuinely just curious !! I’m quite young, still underage, but I’ve always been indecisive on whether I’ll have children. Of course, many of you may be thinking that I shouldn’t be thinking of having kids as I’m still virtually a child myself but some days, I want kids and other days I’m scared of childbirth etc etc. I think the ideal life for me right now is DINK life, it fits with my many preferences (laid back lifestyle, travelling, abundant money, less responsibilities, more free time). But, there’s one thing I’m scared about which is that what if I have a husband who one minute appreciates having DINK, then the next minute he wants kids and leaves me for someone who also wants kids. I guess my worry is that there’s nothing holding a man down, and this worry is multiplied tenfold when thinking about the “biological clocks” of women, like if I’m fifty it’ll not only be more dangerous for me to give birth but I also may not hold the ability to, and if I’m fifty and my husband leaves me to have children then I’ll be old, alone, and I’ll only have my job to rely on!!! That’s genuinely a nightmare; of course not trying to hate on anyone whose life is already life that, it’s just personally not for me. I’m sorry if this has happened to you, please share experiences down below. Also I’m sorry if this wasn’t very articulate either… 😖