I don't think its that serious, as you have already got a thought about your obsession/addiction and how to reduce it.
Everyone needs hobbies for their happiness or for some stress reliever. so it's not required to completely stop playing games.
I would say it an addiction not an obsession since you can slowly make time for your job then you can slowly control yourself.
As your still young and just started working, you have time but as your career grows, it becomes denser and then you can set yourself right on the path.