Sociopath?

Asks a reader:

Good morning, or afternoon, evening depending where in the world you find yourself, I'm in the UK.
The amount of these emails you've probably had I've no doubt must be overwhelming and somewhat tedious, but I am compelled to send you another for your perusal, and, hopefully, an insightful opinion.

It's that age old question you are surely plagued with...am I a sociopath?

I'm a 37 year old male and several times, by several different people, most notably my mother, I have been asked, or, had suggested to me that I am a sociopath, I have based myself on self diagnosis and don't believe I am, but, I'd like your opinion if I may.
There are many factors in me that would suggest I am, but in my mind, there are also many which tell me I'm not.
I have recently met a girl who is a self diagnosed sociopath, and I developed an almost instant infatuation with her.
Like nothing I've known before, I can't say for definite if it's love I feel, but if it is, love is good. It is her diagnosis of me which leads me to question myself to you.
I am different, I know that, I know I think.differently to my friends and family and they know it too, but a sociopath? I'm not sure.
Ok, I'll get down to it.
I'll try and keep it factual as I have, as you may already have noticed, a tendency for verbosity.
I have a remarkable memory, I'm pretty sure I could remember being born if I tried, and I can recall minor events throughout my years in perfect clarity, so, if I may, I'd like to share some with you.

As a young boy my mother feared to reprimand me for wrong doings, not because I was violent or angry with her, but because, as she stated, I would stare emptily at her like I wanted to kill her and it frightened her to the point she couldn't make eye contact with me. I quickly learned that I could use this to my advantage and would push the situation beyond what was acceptable to gauge the reaction I could get from her.
I still do, in all walks of life.
I am a practising and passionate Sadist in the bdsm scene, I use the look to frighten the living shit out of potential partners, and it works infallibly.

You know what? I'm going to stop.
I could go on about every moment through my life, but I'm pretty sure you've heard it all before.

I ruin people for pure pleasure, I let people come to me online and in person and find every flaw in them, physically and mentally, as they talk and move I watch and listen.
I was obsessed, well, am, obsessed with Stockholm syndrome, but now I think it may be more than that. I get into people's minds, make them dependant on me to the point when they begin to panic if I don't reply or agree to see them. I become, effortlessly exactly who they need me to be, I build them up, make them exactly who I know they want to be.
Then watch them burn.
And I love it, I quote lyrics from songs at them as they break without them realising I'm doing it. But I don't let them go, I keep them dangling with promises they're the one, only them, that I can change...for them...then I do it again. And again.
I could make them kill themselves, I know I'm perfectly capable of it, but I'm too aware that our conversations via text will likely be on their phone, and I don't want to go to prison.

I do tend to go on.
Apologies for wasting your time, I'll self diagnose online at somepoint.