But what's the good of all these gigs and fun and socialising and experiences, if I don't make something out of it all? Gah. I should be writing.

Think if it as subconscious preparation for writing. You might not remember the exact details, and you might lose some ideas you think up, but it will compost down in your back brain and provide nourishment for other ideas later on. It's neat because you can justify pretty much any indulgence, "I'm just nourishing my idea pool", without having to do any writing.