Did something happen to trigger your general irritation, or is this "normal" for you?
Do you have someone to talk to? Although you say you want to be left alone, you are also looking for something from people that you need and are not getting.
Maybe some hard physical activity might work off some of the agitation---don't know, it works for me at times.
Remember too, although it may seem rude to someone, you don't have to roll down your window, or go out and talk with others.
Ok, I will shut up now....