Is it sad that I'm worried about being shot?

I’m due to travel around the US in a few weeks and I’m starting to get worried that because we’re spending such a large amount of time (6weeks) there that it’s longer for things to happen. Like being shot for example. Or car jacked or mugged… I’m not a paranoid person usually and I’ve been to the states before.
Am I crazy? How common are shootings really? Eek!