“If you have to force yourself to do something, you are less willing or less able to exert self control when the next challenge comes along.”– Kahneman, D. (2011). Thinking Fast and Slow. New York: Farrar, Straus and Giroux. p. 41.
In the experiments conducted by Roy Baumeister, participants who were instructed to stifle their emotions during an emotionally charged film were less able to perform on subsequent tests of physical stamina.
This phenomenon is known as Ego Depletion.
What does this mean for people in the workplace, home, or other aspects of our lives for people who keep rigid walls up with people and hold back on showing emotion?
The results of the experiments above would suggest this is tiring for them. Doing so for extended periods will have a potentially harmful effect on their physical and mental health. They may be less able to resist temptation in other areas of their lives which could manifest in addiction to food, alcohol, drugs and other addictive behaviours.
So, I have a few questions for you:
- Does the phenomenon of ego depletion, as described, match with your experience? 
- Do you see poor behavioural choices because people, including you, build protective walls?
- How could being aware of ego depletion assist you?
 There are some criticisms of the theory of Ego Depletion, as there are of many theoretical models. I encourage you to do your own research.