"I can be quite impulsive, and I don't want to get trapped by my own poor decisions."

All the more reason to delay having a vasectomy. Give yourself time to think, there's no rush. Unless you're tired of wearing condoms there's not much to gain here, other than making it some kind of statement of intent.

I hope you will take some time to consider whether the vasectomy is an impulsive decision, but ultimately I know it's none of my business. It's your body, it's up to you.

Best of luck with finding enjoyable ways to spend your free time.