In our bodies there are hormones called endorphin, oxytocin, dopamine and serotonin
When you doing something good for you. You are feeling happy.
It's how evolution made us
Your brain works something just like this
FOOD - EXERCISE - SEX - SUNLIGHT
Reason why normal activity doesn't make you happy, Is because you are overconsuming PORN, JUNK FOOD, GAMES, TV and ect.
You NEED BRAKE from overconsuming and
YOU WILL BE FINE