Something can be defined as an addiction if it is both a habitual behaviour and it detracts from your normal daily life. In your case it is detracting from your studies. You realise this yourself.
Of course it will be tempting to do other things than studying, because studying is not always interesting and you don't always see an immediate reward. With gaming the rewards come a lot sooner and the content is far more likely to be exciting to you.
However, the net result of completing a game will be that you have to get a new game. Your life will not be enriched or enhanced, you will not be richer or more secure, you will not have learned any real life skills. Consider it like having been in a temporary coma. Life is passing you by as you sit there on the game, and at the end of it you are a few hours/days/weeks older and have nothing to show for it.
Studying is your investment in your future, it is what will get you the things in life that you want. Gaming gives you nothing in the long term, just a few short term highs.
You need to start to self regulate. Set aside time for your studying and make it your priority. Then gaming can act as your reward, but make sure that you study FIRST. Don't think "I'll game for an hour and then I'll study" because you will invariably end up breaking that commitment. Instead, set aside a period of time for study and at the end of that time maybe take an hour to game.
If you can't be disciplined with gaming and studying then you would be best served by removing your ability to game.
You will have plenty of time to relax in your future, if you put in the effort now when it really counts.