It takes practice like anything else, but one trick I found is to pick something that you definitely won't ever want to make money or a career from. Maybe you

It takes practice like anything else, but one trick I found is to pick something that you definitely won't ever want to make money or a career from. Maybe you have absolutely no desire to be a painter or artist. Pick up a pencil and just doodle for 30 minutes. Get some cheap paint and a small canvas on your way home from work and just spend an hour going for it. Maybe you've always wanted to try fencing. Find a place and take a couple classes just to see what it's like. I'm also like that, anything I start as a side project almost immediately becomes "if I don't change the world with this, why am I wasting my time?" So I had to start doing things that I know will never amount to anything, and specifically tell myself "This will never matter." When you can accept that you're spending a little time on something that's just for its own sake, then you've done it - you're experiencing an honest-to-goodness leisure activity.