The Psychology Behind "Mind-Reading" and the Pressure to be Perfect
Interested in Learning More About What People Think?
Learning More About Theory of Mind and How Are Brain is Wired to Think About Others and Ourselves:
If you were interested in the short clip about the study of the "Theory of Mind" in infants you can find the full link to the TED Talk by Dr. Alison Gopnik below: What Do Babies Think?
If you want to find about different studies that have scanned people's brains as they have thought about themselves versus other people and objects check out the below study abstracts (abstracts are short study summaries at the beginning of studies):
Harris & Fiske (2006) Dehumanizing the Lowest of the Low Neuroimaging Responses to Extreme Out-Groups
Learning More About Trying to Predict the Actions and Thinking of Others:
If you are interested in POSSIBLY improving your skills in detecting lies by others watch this TED talk by Dr. Pamela Meyer: How to Spot a Liar.
For more generally thinking about why people act hte way they do there are many factors that influence this from your genes to your life experiences but Dr. Tony Robinsons covers a few motivations that commonly influence people here in this TED talk: https://www.ted.com/talks/tony_robbins_asks_why_we_do_what_we_do
Please remember that all people are unique and react to different situations and people differently and although you can watch someone's facial expressions or it may help to know more about the traits, likes, dislikes, and past experiences of others to predict their thoughts and feelings there is no way to read anyone's mind at every moment. There is no one theory that will allow you to predict the thoughts and actions of all humans as we can act more and less irrationally based on a variety of influences. If you do not believe me on the evidence against the existence of telepathy (reading minds) then read this: 
Learning More About How Your Biases that Hinder Your Ability to "Mind-Read": Check out Crash Courses in Psychology in general. Here are two videos with one talking abou thte skills and biases of your brain and another talking about our proneness to develop stereotypes and prejudices: Brains Vs. Bias: Crash Course Psychology #24 Prejudice & Discrimination: Crash Course Psychology #39
Learning More About Coping With Perfectionism: If you more interested in a way to overcome perfection and think about how to use times when you are not "perfect" as times to become a better version of yourself check out the Growth Mindset discussed by Dr. Carol Dweck in this Ted Talk: The Power of Believing that You Can Improve. For ideas on how to better cope when you do feel stress whether that is due to not meeting your own standards for yourself or any other form of stress check out this interesting talk by Dr. Kelly How to Make Stress Your Friend.
Also, if you are more interested in how thinking about what other people are thinking relates to the study of empathy in caring for others you can watch this interesting TED talk by Dr. Jeremy Rifkin: On the Empathic Civilization