Let's say you really want to be a vet. You're good at it and enjoy doing it. However you also enjoy doing the space thing, but just not near as much. And let's say you've never been into space before. Just simulators.
Then become a vet. Sometimes even the seemingly smallest, most inane jobs are the ones that do truly help. For example, being a vet would be helping many animals and in turn people.
If you want to become a video-game designer, go ahead, but give back to the community. Don't just forget those around you. Find a way to take part in your community, start up your own charity, work under a nonprofit organization, anything. Any job can bring joys to others if you do it well, you love doing, and you do it partially for yourself and partially for others.
There's no rule saying if you can help you have to. Just because it's possible to join a non-profit organization does not mean you are morally obligated to do so. If you enjoy video games and programming do that.
"Love your job, and never work a day in your life."
Quite. Though you certainly shouldn't hurt others because you enjoy to do it. :3
Another tip for that, concentrate on building, not destroying.