Why we fail to study hard?

Why we fail to study hard??
Why we don’t donate our time to our goals??
Why we leave books on choice and busy in time wasting means??
Like who pull us toward these all unwanted stuff .
We are unable to stop these things.
It’s normal but these are irritating .
We make a schedule but after completing the schedule we feel deficiencies.
That’s normal.??
I am totally fine but completely lost .
Just like my situation many people are alike but can’t narrate it . It’s anxiety???
It’s depression??? It’s worthy??
How to manage?? I start alone then leave books for weeks .I enjoy for a while then think I can’t do this . Please help me