Is it allowed to start testosterone around 16-17yo?

I am a trans man in senior high school. I've been planning to start testosterone for a long, long time; my parents are okay with the idea and fully support me in this decision. But I have no idea where to find hospitals/clinics for it. I know that I have to get blood and lab work done, and then go through an endocrinologist to get a prescription. But I just don't know if that's allowed in this country. I have parental consent and would like to start on T, but I don't know of any resources or how to begin. My mom told me that the lab works/blood works should have a reason for why we have to do it, and I am not sure if that's an acceptable reason.

Please help.<:)