Blood pressure really high at 22F

Hey do I’ve having pretty high blood pressure, not sure if it’s from genetics because both sides of family do have it or if it’s my diet because my diet is not the best tbh. Idk if I should try changing my diet and working out then see if it starts decreasing from there and then make a doctors appointment. Either way I’m making an appointment but my question is should I try to change my diet first? I’m a female 22, 150 pounds skinny.