>And advice?

Yeah: don't sit and play video games for very long. There's nothing wrong with not being able to focus on one thing for more than half an hour. Get a book, do some paint by number, whatever. Keep switching it up every half an hour.

Although.. if you can't focus for > 20m but you WANT to be able to, go get checked for ADHD. My 40+ lawyer GF only recently was diagnosed with ADHD, but now that she knows, its a complete game changer. Yeah, the ritalin or whatever shes on helps her focus a bit, but the tricks and mental exercises really help her focus on tasks for hours now. She still flips between mobile games, painting on her tablet, colouring books, knitting and reading books - all within a half hour period, but for work at least she can now focus for hours at a time.

You could also try gaming on a treadmill or a stationary bike. Maybe the not sitting part is just enough to allow your brain to focus on the game.