I've been considering getting a vasectomy recently, and this thread has been a huge help in granting perspective and context.

Even well into my twenties I still don't really have any interest in kids or long term relationships for that matter. I've never really been good at them and attribute a lot of that to my parents making fun of me at a young age whenever I was "dating" someone etc.

The biggest factor for me is having spent years getting my financial life and mental health in check. The idea of doing something like having a kid and throwing both of those aspects of my life into oncoming traffic seems unwise. I've also had good friends seem to fundamentally change in very negative ways after having kids. Some have already been divorced and largely will never have a life they enjoy again.