I started out not taking it seriously enough, then going the other way and it was WAY too serious, but with time, age and lessons learned (some lessons that is), I learned to slow down, relax and breathe and try to find a balance. It's not easy and I don't always get it right or it takes time, but finding things to distract yourself away from the serious can help. Finding things you enjoy on your off times that engage the mind has really helped me.
When I was in shape and younger it was a lot of physical things. Surfing, volleyball, archery, camping, roller skating, beach parties or just a bonfire with someone special or a few friends. Art was another thing that helped me. Now, I can't do those things anymore, so I find other ways. I still work on art and am trying to expand the mediums I practice. I play games online to keep me focused, I read and talk with people from all over the world, but as I'm older, I've come to realize...for me at least...that all the crap I focused on before and thought was important, just wasn't and that people can freak out, can yell or get pissed at me for reasons that don't exist and it's fine. It doesn't really impact me or my life unless I let it. If they want to blow a gasket over something, that's their issue. If I am at fault and it's not a small thing, I'll apologize and do my best to fix it as fast as possible, but again, reminding myself that life doesn't revolve around that one thing and I'll take care of it.
Don't know if any of this helps or if I just rambled on and missed the mark, but that's the best I can come up with. It's always different for each of us. You need to find what works for you. Whether it's calligraphy or bonsai trimming or landscaping or painting or reading or whatever. Hey, you could find out you're great at paintball for all I know. :D But you need to find the balance that will take you out of the mindset that every little thing is a serious matter.
Okay, shutting up now. :D Hope you have a great day and can figure this out long before I did. Best of luck.