Mudslides I'm in the same situation, and I know we're not the only ones.
I think the problem is that London is a very extroverted city, and I've joined sports groups in the past but it always seemed like everyone had already formed cliques and their own friendships, so it was pretty difficult.
I have 3 or 4 close friends, but they all live about 5 or 6 hours away.
I've joined a few book groups, which I've found particularly good for introverts. You're surrounded by people who like to read, and we spend about 3 or 4 hours together every few weeks, which is nice, but not too pushing.
I've found some great book groups and writing groups on meetup.com, and there's loads in London, that aren't full of people who are too in your face and it's nice to just spend a few hours every so often socialising with people who have similar interests, even if you don't make life long friends out of them. There's also a Buffy group that meetup every now and then in London.
But definitely don't think it's just you. Most of us adults are in the same situation, particularly when we like books/tv/film etc... I also hate the Summer too! I have hayfever and just generally can't stand the bloody heat. But apparently that's weird, everybody's supposed to love the Summer... *sigh*
🙂 xx