You are probably sunk with a 19. I'd say you should continue your mcat prep for a year while doing some retakes to get yourself over 3.0 in sgpa and get an mcat in the mid-high 20s.
If you find that you just can't get into the >24 range you might need to consider something else as medical training is full of standardized tests that you have to get past. A 19 isn't a good predictor, but you can probably do much better with time.
keep your head up and keep working