In talking with many people in real estate and in life I know bad external circumstances seep into them and make them unhappy. It just seems like it is natural. You get that bummed out feeling. But I am here to tell you that like taking an eraser to a highly chalked up blackboard, start erasing those bad feelings. Feel them yes for awhile but know that "inside", you are good. Inside is where your joy lives. Let no one person or external circumstances rob you of that goodness or that joy.
You deserve good feelings inside. You have to literally practice detaching your happiness from external circumstances. Maybe compartmentalize your day. At work or something someone said to you made you feel bad. Go home, feel that pain, but then release it. It wasn't you, it was that person or situation. You are still capable of being happy and having joy despite that. Find your inner peace.
And then remember, there is always tomorrow. A new day again to make the world a better place. Why?
BECAUSE YOU ARE IN IT with your inner joy.