There's a philosopher called L.A.Paul who writes on exactly this – how to make big life decisions that you cannot rationalise your way into.
She developed a thought experiment called the Vampire Problem:
If you were offered the chance to become a vampire — painlessly and without inflicting pain on others, gaining incredible superpowers in exchange for relinquishing your human existence, with all your friends having made the leap and loving it — would you do it?
The trouble is, in this situation, how could you possibly make an informed choice? For, after all, you cannot know what it is like to be a vampire until you are one. And if you can’t know what it’s like to be a vampire without becoming one, you can’t compare the character of the lived experience of what it is like to be you, right now, a mere human, to the character of the lived experience of what it would be like to be a vampire. This means that, if you want to make this choice by considering what you want your lived experience to be like in the future, you can’t do it rationally.
She dives into a lot of depth on it ( Maria Popova did a good overview of it here )
but eventually says the only way to make the decision is to ask yourself if you want to find out who you would become if you said yes:
In many ways, large and small, as we live our lives, we find ourselves confronted with a brute fact about how little we can know about our futures, just when it is most important to us that we do know. For many big life choices, we only learn what we need to know after we’ve done it, and we change ourselves in the process of doing it.
I’ll argue that, in the end, the best response to this situation is to choose based on whether we want to discover who we’ll become.
That still feels risky to me, since the impact of finding out is much bigger than me – what if I find out I'll become an unhappy mother, and that'll then impact my children?
Big part of why I don't think I'm going to have kids. No judgement on those that do, but it's not a risk I'm comfortable taking, 'hormones kicking in' or not.