How should I go about getting a vasectomy?

I’m 18 years old, Central Florida. I want a vasectomy for many reasons: first of all, my gf doesn’t want kids. Second, I have a family history of Addiction, Heart Problems, and a few cases of developmental disorders like Cerebral Palsy and would honestly rather adopt if I ever wanted to raise kids. Third is probably obvious.

My parents don’t support this interest at all; they think it’s shortsighted and laughed me off the first time I tried bringing it up. I’ve tried to talk to my dad about it in follow-up conversations since he’s a doctor but he keeps shutting me down. There’s a male reproductive clinic about 10 minutes away from me but I’m a little scared to do that alone because I really don’t know how to schedule an appointment or go through with anything like that on my own. Since he works for UFHealth he’s always kind of handled my and the rest of my family’s appointments himself.

I just wanted to ask not only for advice or suggestions on how I would go about this, but to get perspectives from other people: is this a case of my parents being overprotective or biased because they want grandkids or is this just a case of them being right/logical and I’m just less inclined to listen because I’m biased and hormonal? Figured if people are concurring with what they’re saying then they’re probably right.