How dangerous are New York and Massachusetts for foreign students?

I have never been to the USA but I have heard that there is violent crime in many places. Here's the deal: I am much smaller than the average American person. I am only 5'4" and very skinny. Would this make me a very easy target for muggers or robbers? I'm not the type of person who gets into fights or would willingly go to shady areas.

I will be living in New York (Buffalo, Rochester, Suffolk County) or Massachusetts (Waltham).

How dangerous are New York and Massachusetts for foreign students?
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