I do a lot of things considered sociopathic, and I never realise what I've done until I look back on it.
For example I completely used my ex girlfriend. I never really had feelings for her but I asked her to be my girlfriend so I could raise my social status. I lead her on for about a month as I didn't know how to tell her that asking her out was a mistake, and to make it worse she was falling for me. So I just ended it abruptly and it must have crushed her. I wasn't really aware of how blatantly I had used her until later. It just seemed like what I was doing was the natural thing to do.
Also I get an enormous satisfaction out of guilt tripping people who have wronged me. And I can be very manipulative without realising it, like using guilt tripping, I can be very needy and dependant, I martyr myself in people's eyes, in fact I pretty much do most of the things this article lists http://www.wikihow.com/Pick-Up-on-Manipulative-Behavior but the worrying thing is I don't do any of it consciously, I don't say 'I'll guilt trip now' or 'time to martyr myself', it's just what seems like the thing to do at the time.
I realise I'm not a complete sociopath like my dad, as he has severe issues with controlling people, like he controls what me and his gf can wear when we're seen with him. Also he has been abusive to our rabbits, also he is never wrong about anything. Instead of admitting he's wrong he'll say 'I was on the right lines' or he'll make up an excuse. But do you think I might be slightly sociopathic?
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Most of that is just being human or being a dick. Getting payback on people who have wronged you is supposed to feel good, unless you are Gandhi or the Buddha... If you aren't doing it conciously, that's a good sign. Someone who thinks and plans how to manipulate people is more likely to be a sociopath than someone who just does it by instinct/spur of the moment. To beat the thoroughly dead horse in this thread, it just makes you a prick what you did to your girlfriend, not a sociopath.