Time having fun is never time wasted :).
You would be more happy if you had done something productivity while not having fun?
See you are human you will always complain :).
You could have studied from your 14 untill your early 20's get a grade....and then you maybe have a nice job and probably feel everyday you wished you did not study so much and had some fun aswell;...
It does not matter , if you feel a bit down you will always see your actions negative;
This weekend you only studied => Monday you will feel down if you hear everyone went to a party/shopping, had some fun.
This weekend you went out/played videogames => Monday you will feel down because you wished you put some effort in studying/working.







