In a lot of ways I'm very much the same, for the last several years since I was about 26-27. Something flipped and I all but quit drinking and partying and was content to stay at home and busy myself with my beautiful wife, games and things like RLC. I do consciously avoid a lot of social outing even if it's just family or close friends, I'm just happier chilling at home outside of work.
As long as your not a depressive person it's a perfectly happy existence but really doesn't lend well to this type of environment, obviously.