I appear to be one that people (random) seem to approach and/or confide in.
Typical things would be the band at a work do when everyone else had gone in for food and I was having a cigarette, totally relaxed and said 'well great, we can have a break so! They seemed to think I was 'one of their own'. Clearly didn't think I was the big boss or they'd probably have kept playing!
Other things would be the likes of cleaners having a little moan to me in public toilets.
Waiting staff giving me knowing lucks and winks.
People always asking me for directions.
That sort of thing?
I don't have a nice smile (bad teeth), but I suppose I do smile easily and probably don't have a resting bitch face.
At work events I'd be suited and booted, but people seem to sense I'm not the big boss and that I'm going to be easy to talk to.
I am easy to talk to and am very friendly, I'm just amused that they can tell before I even open my mouth!
It's possible that I maybe wave or something at people - something I'm not aware of doing - that gives away the fact that I'm friendly, but sometimes, people just confide in me!
E.g.s from my youth would be that I'll be the one stuck for a half hour in the pub toilets consoling a girl whose boyfriend has dumped her.
That sort of thing.
I try to be less approachable, headphones in, head down, yet still I'm the one someone will randomly stop on the street to see if I'll help them read their google map (can't read maps).
Is it something particular about the head of me? 
I should add, that I don't mind at all - love helping people - just more curious I suppose as to why it's always me?