My husband, a small handful of close friends. I have no family of my own any more. Well, I have a mother somewhere, but not seen her in years.
I definitely have trust issues - I trust hardly anybody. Everybody could turn on you in an instant, even if you've known them for decades. So generally I keep them at arm's [arms?] length. I've just got very good over the years at doing this - I'd be willing to bet that none of the people I do keep at a distance actually realise I'm doing it.
I don't generally hide the fact that I have problems - I never have, and I don't hide the reasons behind them. I'm also quite good at small talk (though I loathe it, and it makes me feel uncomfortable, I can natter away about nonsense for ages), so I appear to be quite open, and trusting and accepting of people. In reality I trust hardly anybody. I can probably count on one hand the people I do trust.
I'm still waiting for therapy (and I seem to be confusing the NHS), but I have a history of not letting therapists in. And rationalising myself out of help. I think I may be starting to trust the GP keeping an eye on me at the moment, which is a start at least.
But as to isolation - if I'm in the right mood, I'll push everybody away, even the people I trust the most, and even if I know I'm doing it.