Because conflict consumes energy.
Sometimes that conflict is physical.
You may be feeding your body things it constantly has to fight against. You may not be sleeping enough. You may be overstimulated, sedentary, tense, disconnected from your breathing, or neglecting your body entirely.
Your body is always trying to heal, regulate, and keep you alive.
When your relationship with your body is poor, exhaustion becomes normal.
But mental conflict drains energy too.
The mind consumes enormous amounts of energy, and most people are running constant internal wars: self-criticism, fear, obsessive thoughts, contradictions, resentment, shame, attachment, overthinking.
Every internal conflict pulls energy in multiple directions at once.
One part of you wants one thing. Another part wants something else. Another part is afraid. Another part is trying to protect your identity.
That takes energy.
No wonder you feel exhausted.
The solution is not simply forcing yourself harder.
It begins by changing your relationship with your body and reducing unnecessary conflict within yourself.
As the conflict decreases, energy naturally begins returning.