Things I say that I later regret!

Okay, I just said that I hate my job! I feel terrible about this! But my job is a very high stress place and brings out the worse in me! As I've grown older I have become practically allergic to dealing with the public!  I really can't stand dealing with people but yet I can be very outgoing from time to time. Most of this comes from my mistrust in people and past experiences. My work requires me to deal with the public CONSTANTLY! The clients here are extremely dependent on us and are spoiled brats who whine if they don't get their way! It is also a place of very high people traffic and you don't even have the chance to breathe when one person is exiting and another is coming in. It's like a subway car!

I find I always say things like 'I hate people, I hate my job, I hate this person or that person' and I don't necessarily mean it, it's just that they will annoy me. Often, I find I like to be left alone if I'm in a bad mood or just in a pensive state. I'm HIGHLY impulsive and act on instinct pretty much immediately! One day it's going to get me in very big trouble. It also drains me emotionally being this way. This is part of why I want to change but it's very tough! I'm so used to being this way already!
How do I start to take the small steps in order to begin this process?  I can't fathom how I'll ever stop being so guarded, and at times so bitter and angry. I always think people are out to get me or to judge me. It can never be anything good when it comes to me but why CAN'T IT??!! I'm not a bad person, just a person who needs a lot of spiritual work!