DBH had mentioned these personality types in passing, I would love to know which he is. I shall try to get him to do it.
As for your original question, soutra, I know it is hard work, but I did read something about 'networkers' years ago that made me rethink my own hermetic inclinations. It said that the more people you know, the more support you will have in times of crisis. Then I moved here and saw it in action, the villagers here are amazing. When a friend had a hip op they formed a rota for guarding her while she showered, took her meals, went in to talk to her every day and gave her lifts until she could walk, and did her shopping. I was on her rota but then broke my ankle - and I had plenty of visits and enquiries of my own, but was not on my own as I had DBH with me, and then DS on holiday from uni.
The way they look at it is, you will be paid back when you need help. That's why I always advise people to join clubs or go to church Dos, even if they aren't religious they can help their community. Someone on here was saying that their DS received enormous amounts of help when his wife was ill and he lost his job.
I don't believe that any person is boring, you just need to find what it is that they feel strongly about. Soutra is definitely not boring so should have no problems, with a bit of a push.
But yes, that initial moment of walking into something on your own - yet I never have learnt to arrange to go to something with a friend. I still automatically go to do everything on my own. I hear friends arrange to meet up at the end of our lane just to walk to the village hall on the way to WI - then realise how much they too hate to walk into something on their own. they probably think I am far more confident than they are - not true. I just get on with it.