I will just mention that vasectomies are reversible, and also they don't always work... Sometimes bodies heal the damage!! It's weird.
I was told to "consider it irreversible", because the chances of success in a reversal were around 55%. And, even if the reversal is successful, the fertility rate is vastly reduced because weaker, thinner pipes or something like that. So, at best, you're basically halving your chances of ever being able to have a kid.
I had it done anyway, in a heartbeat. Nothing sweet or heroic about it. Was glad of the excuse. I spent my 20s waiting for that revelation everyone promised, where I'd realise how incomplete I was without a child. By 38, I was pretty certain that revelation was never coming. Once I met someone who felt the same way, I booked in. No hesitation, no regrets (7 years on).