I tend to be pessimistic and see depression as the necessary, logical response to world. How to change it?

I see sadness, seriousness and depression as cool i guess like it is the only coherent answer towards this cruel, mortal, careless life. I desire to change that. I want my default response and emotional state be optimistic. How can i replace and fix this depressed character with a cheerfull, pleasent one?

By the way, if your suggestion is to get professional help, do not even bother yourself with writing down.

I tend to be pessimistic and see depression as the necessary, logical response to world. How to change it?
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