Why is important to know about yourself?

This world is full of good and bad things and it is our mind who decide what is good or bad as per its experiences. Everybody has a good intention to do things, no one does something bad intentionally mere to hurt someone's sentiments. That is more or so filmy thing for me. So if nobody has the wrong intention then, why are people so vulnerable out there in this world? no one seems happy, everyone complaining about others.

In my view, this is just because we don't know ourselves. We build a kind image or personality in a surrounding which lacks authenticity and we do this merely to gain attention from people or become likeable in the eyes of the public. As a person starts getting appreciations from people for his/her hypothetical image he/she starts believing that okay this is my real personality. But mind could not function this way for a long time, because, what that person is pretending about his/her image isn't something he/she believes in reality. So now the mind is in conflict and striving for authenticity but he/she tries to suppress his/her original feelings&emotions and he/she continue to live their pretending life mere the sack of public approval. This dilemmatic situation leads to anxiety, depression and unhappiness. For the sack of maintaining that hypothetical image, he/she starts complaining, gossiping and blaming others and these things tighten the situation and make it worse.
Now the solution for the illusion is simple to stop pretending or behaving like an intelligent, perfect and stop being likeable.
Start finding original you, what you like, exercise it doesn't matter what people think about you, what you don't, stop that, no need to carry that forward.
It is fine if a few people like you, love to talk to you and find interesting, but at least they will be a genuine one. So be grateful for them and their love & support, gratitude will glorify your authenticity.
Embrace your imperfections, it makes you unique and different from others. It is good to be different than being the same. Your mind will be in good space when it has one portfolio or personality to manage.
Find your passion and devote your most of the time to it and work hard to follow your passion. It will help you with two things; one, it will give you what you want to be in life, second, it will quash out your pretended image because fake things barely able to do hard work or stand by during the grinding period. So eventually it will help you to find you, " The original you".
Judging and comparing yourself with others always leads to inferior complex, fear and you'll start undermining your abilities. This also pushes you to develop a perfect image, which is a myth, no one is perfect in my view. So don't run after it your imperfections will help you to develop a unique and catchy image which will obviously be your original image.
So be simple, be real.
 Thank you.