I've become a terrible person. Will I be one of those bums on the street who yells and curses at people?

Get a book on ertiveness training!!!!! agood one is called, do not sweat the small stuff, and thats what you are doiing, to the point of being insecure!! why should you have to sell everything , and run into the woods, the problems will still be there, because they are your problems, no one else's. you have to deal with them, sounds like its time for a meeting, with all these people, or find another job, and do not let people use you!!! I have always been easy going, and have been taken advantage of, not any more!! the older we get the smarter we get. You need to speak up to these people, Office jobs can be ruthless, I stopped with the office work years ago, got tired of the bull$hit!!!! changed careers, and lovd it, also made way more money in the new career!!! do not run from your problems, face them, you will be much happier!!! good luck to you, you sound like a really nice person! hang in there.