MD I really want to become a doctor but is it too late for me now?

I'm 19 just finished my second year of science undergrad going into my third next year and now i just realized that i really want to become a doctor. i didn't know what i wanted to do with my life before but i figured out now and i'm 100% sure this is what i want to do and want this more anything.but i think i screwed myself up i went into university straight out of high school not knowing what i wanted to do made some stupid mistakes and ended up doing horribly i looked more into doctor thing and flipped when i saw the prereq courses needed for med school as they were the same courses i was taking in my science bachelor program

1 year 6 credits each of Bio, General Chem, Physics, Organic Chem, English and biochemistry

which i have almost covered in the last 2 years of my program without realizing and did horribly in

in Bio i got a -C and a -B
in general chem i got a -C and -B
i took 1 semester of English and got a D
Organic chem i got a B 1st term and failed 2nd term gotta retake it
and in Physics i got two C's in both terms

my overall GPA right now is 2.0 after 2 years of university
i haven't even tried the MCAT yet

So you can see i damaged my prereq GPA pretty badly which turns out is really important for med school applications

What can i do now i feel like a monkey trying to reach for the moon :(

any advice would be much appreciated thanks