Maturity is achieved when a person postpones immediate pleasures forlong-term values.
-- Joshua L. Liebman
Study skills is time management with good allocation of limited resources, ie., time at you disposal.
Time management with a long term perspective only come with maturity.
If you are not able to control your child-like thinking and place pleasure before study, you will not gain much in your study in the long run.
You need to exercise your choice and your success is, indeed, in your hand!