Can a 17 year old guy became impotent?

Answer 1

Yup, of course, I'm 26, and when I was 19, and under a great deal of stress I suffered from it, the medical conditions that cause also don't discriminate on age, its just more likely that older men will suffer from it.

a lot of impotence is psycological, and that's where I would start looking if I were you, see a doctor, or psychologist (whomever you feel more comfortable with) and discuss possible causes and treatments