I think it's really awesome you had a positive experience with this job. Sorry you're leaving when it's going so well.

Maybe work isn't the place to push yourself? Maybe now that you know you can handle and even enjoy something more socially demanding you can do some other things you've avoided? Idk, I know little about your situation but does sound like you got some valuable information/insight from taking the chance. With more money and less commute other options could be available for you to explore where you're income isn't dependent on avoidant traits not being overwhelming...