To be or not to be...a doctor?

Hello, I'm 19 and soon to be a sophomore in college. My major is biomedical science. Before my freshman year I had myself convinced that I wanted to become a doctor. After a couple of bad grades, bad choices, and being a part of a school play...I find myself questioning whether or not I still want to. I was glad to not be the cliche college student who doesn't know what they want in life, but now I feel as if I belong to that category. I had great grades in high school, and the classwork in college i find easy (so far), but my laziness and procastinatious (fake word) nature helped my GPA become a 3.0. My parents were quite dissapointed. My dad brought to my attention the obvious fact that med schools aren't looking for students with a 3.0. Both my parents know that (as far as 19 year old with no training and limited experience go) i'm a good actor. They advised me to not be in a school play at college though, because my main focus should be my grades, despite the wisdom in there repressing advice...I auditioned for a play, got a lead role, received accolades from some of the more experienced cast, and won an award. I used this to fuel my ego, all the while my grades morphed into the 3.0 GPA. My dad recently talked with me and said that i need to decide what i want to do in life, he says that my results in college show that i don't really want to be a doctor. I told him that i have three more years to bring my GPA up. He said that he wonders if I can really do that. I began to doubt myself. I told him i plan to major in pre-med, and minor in theater. He thinks that's impractical. I guess the bottom line is, i just wanna be, i just wanna be, successful ( Drake understands). I know that becoming a doctor is a sound choice, which can provide a financially rewarding future. In all sincerity, i think i do want to be a doctor. I want to help people, i want to be useful, i want to be able to cure cancer (which is more of a medical research type goal, but nonetheless...). AND, i want to be an actor, i love the adrenaline rush as the curtains open, i love to hear and see the audience react to my character's reactions...i love the accolades when i don't screw up and do something good. I want to be supafamous (but i know how unlikely that is). I love the theater, because its one of the few things i think i'm good at (NO EMO). If your still reading this, and you have formulated an honest opinion I would love to hear it. I know ultimately this is my choice to make...but your advise would be greatly appreciated. (: