Play Fortnite and I realized that I have very lack of motivation and little happiness. Can it come through Fortnite?
No, generally not from gaming, but if you fall into an "addiction" (you play it, even though it's not really fun) then…
Then I would recommend you to buy a new game! (Overwatch, Battlefront etc.)
Basically, it could be because you have the feeling that you can't get any further (in life) because a new hobby (painting, sport, language…) often helps.
It can make driveless. There are several reasons for this: it is generally important that you get enough daylight for vitamin D and the happiness hormone serotonin and various other hormones that determine your body balance and daytime rhythm. If you play so much indoors, you may not get enough of it.
In addition, one is always under tension in such games, but without the happiness as in the right sport are distributed. Too little exercise does not do the body well and too much tension.
How do you feed yourself while playing video games? Are you drinking enough?
All this and much more is important. Does playing make you happy at all, or is that just the "easiest" way to do something?
Try not to play for a while but to go out and write down what makes you happy.
Video games are perfectly detailed in all details, so you'll always get a reward when you're about to hang out. The rewards exist z.T. Only one tone, a flashing star or a color change. Bigger rewards are points, extra powers or a higher level. With good questions the rewards are the 'thank you', 'helpful' etc. You know everything. But in everyday life you do not get a reward every few seconds. If you really want to achieve something, you have to last weeks or even years, even if you get hardly any rewards. Of course this will be more difficult if you get used to rewards.