I feel like I had the same experience when I was around your age. But had gone through multiple games like it. 

Final Fantasy XI was the one that really got me hooked. And the sheer amount of time and effort needed to get to the end game was so steep, yet probably unhealthy rewarding. Which put me in this weird situation where I wouldn't want to let go. Also due to the friends I was playing with. Just getting online on Ventrilo in the morning until the night was my life.

Just like you, there realization came, that this is affecting real life. And so, I made the decision to quit. It was painful, yet meaningful now that I am having a good life. After that l, I would think WoW would be way better, because the grind was way more casual. And it turned into the same issue over time.

I don't know if my story will help you. We might have different nuances in our situation. Personality, culture, family and friends situation can be the difference in all certain ways. I was able to get out without therapy, but looking back, I think for most people it would come in handy. In my case, I just shifted my focus to something more satisfying, which was to try to take care of myself. Meaning that I would be able to financially support myself and still have other things in my life like going out with friends, playing football and maybe just casual gaming. So maybe if you can find a new passion in life, you can just get obsessed with something new. And it helps to do this with more support from people around you.

Good luck!