The so-called tough guys focus very much on how they are perceived by the people around them. Mentally strong people, however, don't have to prove anything to anyone, only to themselves. They are not afraid to ask for help if they need it.
People who act tough like to show anger. On the other hand, they tend to hide their sadness, fear and even excitement. Mentally strong people do not ignore their emotions, they monitor them. They are well aware of how different emotions affect their behavior.
Tough guys basically perceive their body as a machine that can handle pain. Mentally tough people, however, do not ignore either physical or psychological pain just to impress others.
Healthy self-esteem is definitely beneficial. Acting tough, however, leads to misunderstanding your real abilities. Mentally strong people perceive possible obstacles and can estimate their real potential.
Tough guys feel a certain power over others. They think they have to prove they are in control of everything. This leads to micromanagement and unrealistic demands. Mentally strong people control themselves and try to behave so that everybody has enough space to achieve better results.
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Article source Psychology Today - a U.S. magazine and online community focused on psychology