I know this might be a silly question, but is it better to go to medical school, then to go to PA school?

The choice between PA school and medical school is a personal one. You have to research and figure which field interest you more. Try and compare the two side by side and see which one fits your goals and ideals of a profession you like. Try and look at things like:
-time in school
-money required for school
-responsiblities
-and even yearly salary(even though this should only be something to consider, it should not pick for you)

You also want to make sure were you want to see yourself a few years down the road. Compare your responsibilities as a PA versus that of an MD, will you be limited within the scope of your practice? Will that bother you?

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...."Beyond jealosy and betrayal; beyond hate and desire; beyond pain and death; lies the ultimate revelation; the final choice; the end; because the fate of destruction is also the joy of rebirth" Neon Genesis Evangelion