No one says you can’t have fun or watch tv, but you also must set some limits. Like for example:

1h for playing video games.

1h for watching tv.

1h of having fun.

1-2-3h of studying a chapter from Quran

And when prayer comes, you quit all of this and start praying, praying is more important than all of this, it is part from your life and it prepares you for the life after death. Do you want to go to the highest level of Heaven without being Punished not even for 1 second? If this is your wish, then I suggest for you to set a timetable and you must respect the timetable. If you start to waste your time, then it becomes prohibited for you to do this. All this, is mentioned in Quran.