How do i stop worrying about everything? ?

I worry bout dumb stuff all the time , little things. It stops me doing things , like today there was some dude tailgating me then tried to overtake me and I was so annoyed i just floored it and left him , now I'm worried if he will key my car or summit if he sees it lol , other stuff like money and if I am going to loose my job, how does everyone deal with this stuff ?