You’re an adult and it’s your body, if you want a vasectomy, get a vasectomy.
That being said, I was 100% sure I didn’t want kids when I was your age. Now I’m 37 and trying to have kids. Obviously that doesn’t mean you’ll change your mind, but it can happen.
I live in Germany and know someone who got banned from driving for being caught with weed when he didn’t even have a license yet (so he was banned from being allowed to even obtain a license) and this motherfucker drives over 200km/h over the limit and gets to keep his?