Chances are you're already aware of this, but I've heard from people who have applied to various graduate departments across different schools that your GRE scores can be used to "weed out" students in the initial screening rounds. I can see this point making sense for departments that have received a (unexpectedly) large number of applications for a given year.
As others have already said before: as long as your GRE score is within an "acceptable" range (obviously this varies between each department/school), they won't matter that much. A close friend of mine did much better than me in the GRE (169V/165Q/5.5W - I had a lower V score) but he got rejected from several top schools. One exception I can think of is University-wide fellowships. I was told that my GRE scores had to be within a certain range - POI however didn't specify exactly what this range was - in order to be eligible for a University-wide 5 year fellowship package (I did receive said fellowship package, starting this August).
I did an extremely crazy/stupid thing and only applied to one American graduate program - I had about 5 schools in mind once I sifted through all the information I gathered, but 2 of them couldn't offer funding for the 2017-18 admissions cycle and the other 2 turned out to be not so good research fits. Granted, I didn't panic as much as I should have because I had a fully funded PhD offer lined up here in Australia, but I really wanted to change disciplines from socio-cultural/medical anthro to a more clinical field and thought anthropology wasn't a good fit for my research interests.
In any case, I've been wanting to attend an American university for about 10 years (since I was in high school) and I'm excited to have finally achieved this goal. Keep your head up!