What is this 'ANXIETY' thing?

Anxiety, stress & depression- these three words are most dangerous one in today’s time. There should be free counselling, more awareness on how to deal the situations, apart from that if a person is mentally fit then he or she is living his or her best life. It all just happens because of the society we are living in because we think and care about other’s opinion most. Further, there is no age for for this disease. This is very important issue that needs to be talked about the most.