Since you are 19 you can just go to the doctor on your own ,, are you covered on your parents health insurance? If so, do you have a copay? If its feasible for you to pay for a the copay then just go on your own , see your primary doctor and go from there. If you have no insurance then things get tougher. Do you have a health clinic at the college you attend ? If so start there. Or contact your local health dept and make an appointment there.

Sorry about your dad acting this way.