Mentally strong people display 11 key habits: 1) They are emotionally intelligent and able to understand and manage their emotions. 2) They are confident in their abilities rather than doubtful. 3) They are able to say "no" when needed to avoid overcommitting themselves. 4) They remain rational when dealing with difficult people to neutralize conflicts. 5) They embrace change rather than fearing it. 6) They embrace failure as a learning opportunity rather than dwelling on mistakes. 7) They focus on improving themselves rather than comparing to others.