Phone gets too hot even while using normal apps like instagram, YouTube
That's true I have noticed it too and while charging also it gets way to hot... very disappointed with it to honest black crush issues as well now I kinda regret that I should have stayed with my iphone
Please mention your phone's firmware version.
Go to setting => About => Software information.
Also, is it lite heat or unbearable. Last thing what is the ambient room temperature?
Room temperature is 25 to 27°C
While charging temperature goes upto 40°C
While playing pubg at normal settings like graphics = balanced and 60 fps phone temperature goes upto 43 to 46°C