Depression is caused due to stress, tension etc which is no where in my life. I am a stress free person.
My state of mind which you are calling it a depression, is actually called DETACHMENT OF THE WORLD.
As per wikipedia
" Detachment, also expressed as non-attachment, is a state in which a person overcomes their attachment to desire for things, people or concepts of the world and thus attains a heightened https://en.m.wikipedia.org/wiki/Perspective_(cognitive). It is considered a https://en.m.wikipedia.org/wiki/Wisdom https://en.m.wikipedia.org/wiki/Virtue and is promoted in various Eastern religions, such as https://en.m.wikipedia.org/wiki/Hinduism, https://en.m.wikipedia.org/wiki/Jainism, https://en.m.wikipedia.org/wiki/Taoism and https://en.m.wikipedia.org/wiki/Buddhism. It is also a key concept in Christian spirituality (often referred to by the Greek term https://en.m.wikipedia.org/wiki/Apatheia), where it signifies a detachment from worldly objects and concerns.
Source: https://en.m.wikipedia.org/wiki/Detachment_(philosophy)#:~:text=Buddhism,-Main%20article%3A%20Nekkhamma&text=Regarding%20the%20concept%20of%20detachment,lust%2C%20craving%20and%20desires.%22