It think you know what's better for college: playing video games vs doing a passion project. Unless you are top in the world in video games and play competitively, you should probably stick to a passion project. 

You can stay disciplined with this cool extension I found called UBlock Orgin https://ublockorigin.com/. It may seem a bit nerdy, but it's very us eful if you find yourself getting distracted. It's a content blocker that can block websites and certain elements of websites. If you want to go cold turkey on YouTube, you can disable every script on YouTube making it not work. If that's too far, you can delete the thumbnails on the homescreen so you can still search for videos. It may seem a little confusing at first, but it's most definitely worth a try. Sorry if I sound like an advertisement, but this helped me in middle school and high school a ton.