Thank you for the replies.
Tormentil I completely relate - being in trouble just for breathing, yup. Trying desperately to be perfect and not draw any attention and walk on eggshells to stop the explosions...
The comments about thinking too much about myself or accidentally giving off signals... Hmm. I've always tried really hard to do the 'right' thing, to be kind, and seem to have loads more empathy than others in a lot of situations. Actually, as I'm going though therapy I realise I've previously gone too much the other way - going out of my way to help people, put their needs first etc., so people have taken advantage. Strangely, being slightly more 'selfish' seems to make people treat you better - I guess it's a respect thing.
SilverAcorn I understand the things you've said, and I appreciate the detailed reply. Despite the above, and being able to read body language etc. I wonder if I could be making people slightly uncomfortable, or just not 'clicking' with them fully (sealing friendship) because of some subtle body language type issue. And thus, I won't have been treated the same as their 'real'/closer friends because although on the surface I was the same as them, we hadn't bonded in the same way. I think there may also be issues to do with not understanding/agreeing with social hierarchy (eg. when people would respond/'pick sides' completely differently in exactly the same situation depending on who's involved, who is most popular etc. To a lesser degree, also attributing negative explanations of behaviour to certain people but not others, as if facts are irrelevant...)
Btw, I'm asking on here because I can't/won't in real life! I'm not looking out for slights against me, because I don't want to feel crap, I want to feel loved and included and worth something! I have a few close friends I really do trust not to do this, or to at least still be friends and explain afterwards if anythng did happen, it's the historical stuff I'm trying to put in perspective.
The problem is I keep remembering and having nightmares about all these really painful situations, and I can't sort of 'resolve' them in my head without understanding why. I'm trying to find an alternative explanation, other than "I'm not worth treating properly". I feel terrified and hopeless and sick when I remember these things, and the memories force their way in. So it's not me purposely mulling over things or trying to pick out slights against me, it memories from the past I'm trying to put into context so they don't hurt me so much.
Also intrigued by SaucyJack's comment that I present as typical BPD! The thing is, I don't! I don't tick the boxes for diagnosis, and my symptoms are far more in line with depression, plus anxiety/trauma type symptoms that can be traced back to experiences. And yet, you look at how I feel and something says "Typical BPD". Whilst diagnosisng based on a sort of internal cariacature seems utterly repellant to my scientific and "fair" mind, I'm also strongly in favour of instincts telling us something. (Mind you it's awful the way psychs assume a diagnosis means you must display all the symptoms and thus blames you for things you don't actually do! Or offers treatment for problems you don't have!) What is interesting is that you'd think things like lots of self-harm might put people off, but if these more obvious symptoms aren't there, you're DBTing up to the eyeballs, acting the part, hiding what's inside... even if, like me, you had started to genuinely feel happy and worthwhile... there is still something that others pick up on. Hmm... I know there is a tendency to pick on the vulnerabe, in general. (Sometimes it feels like I took the assemblies in school about the Good Samaritan etc. too seriously, and missed the one where they said "but few people even aim to act like this in the real world"...)
Did actually ask a friend the other day, specifically the scenario outlined where someone drunk and violent was more warmly received, and my friend said "That's because they can relate to them".
Very simple, but I was gobsmacked and am now trying to apply that explanation somewhat, makes a lot of sense!
Also had a minor op this week, and kept worrying about things like them saying "get up off that trolley, you attention-seeker!" or chucking me out as soon as I woke up and was still wobbly. Obviously it wasn't like that at all, and it made me think about the relating thing, and how mental and physical health is treated differently, and how one feels about the whole thing (I feel 'needy' with mental health, whereas with physical I had to be forced to sit down and rest!)
So some tentative conclusions have been reached, and I write this in part in case anyone stumbles on the thread in future!