What worked for me was not eliminating videogames but using them as a sort of carrot-on-a-stick. A reward for doing what I should be doing, if you will. Playing videogames can be a hobby like many others, you don't need to completely eliminate that from your life.

You first need to find what you would like to do outside of gaming, things like reading, exercising, learning an instrument or a language, and so on. Then force yourself to do those things regularly, just half an hour or a hour each day. Even better if you find somebody to hold you accountable and nag you when necessary. As a reward for being "good", allow yourself to be "bad" and play videogames.

I work my ass off during the week, exercise, read literature, study Chinese and meet friends. I achieve enough during the week not to feel bad if I spend most of the weekend playing. The weekend session can be a good motivator during the week, but you have to be disciplined.