How do you give up something you enjoy but you know isn't moving you forward in life?

I've always loved gaming. When I'm not working, sleeping or watching something, I'm gaming. Then I realised how much time I spend gaming, and ultimately it's wasted time. It doesn't get me in shape, it doesn't progress my career, and it doesn't get me a girlfriend. Despite all that I just couldn't imagine giving it up.

What should I do?
How do you give up something you enjoy but you know isn't moving you forward in life?
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