To be up front I am a man.
This is a really interesting thread as I have, this year, come to think that I exhibit covert narcissistic behaviours. A horrible thing to discover in my 50s and worse when I have studied in and worked in mental health for many years. Some of your post OP really resonated with me. I have adult children from a first marriage that I ended by having an affair. I'm still married to my affair partner two decades later but it has really difficult components. A relate counsellor told us there was abuse on both sides. I kissed a friend about a decade ago when drunk - in the house I had bought together with my wife for fucks sake. I have had far more women than men friends, in part due to my job, but have realised I am drawn to be the "nice guy" rescuer who targets those I see as needing saving to feel better about myself. I may have helped some of them but I did it for me.
I have terrible low self esteem and a fear that if anyone knew everything I have ever thought and done they would know how truly repugnant I am. I have friends and colleague who tell me I'm lovely wise and kind. I want to scream at them that they are so so deluded. I feel sick when I get a compliment and in my head neutralise it by calling myself a useless cunt. But I still do the shit I do.
Then this year, thanks to Mumsnet and other reading I realised that my behaviours of being a 'nice guy' were just ways to use others for validation. Even though I can find the validation excruciating I also desperately crave it. I'm not remotely altruistic. I'm the person who buys for the food bank outside Sainsbury's to hear the volunteer thank me when I drop the cans in the trolley.
I realised that the world external to me doesn't feel entirely real and that I dissociate from it and my own emotions quite often, or use low level self harm to quell them. I cannot tell if I have empathy for those who suffer, I more think I want to be the rescuer of people, to do good for my sake. I find scenes of sexual violence towards women in fiction very hard to watch or read. Possibly due to finding the pornographic fiction my dad read (rape scenes, young teens etc) when I was young. But then I have rescuer/revenger thoughts. Narcissistic supply in my own fantasy world. Same when I hear a news story. I can to get to cognitive empathy for the victim or their family but I have no idea if I feel empathy.
I was raised as an only child and conceived as an affair baby. My dad was somewhat grandiosely narcissistic in behaviour and my mother was an alcoholic and I think horribly abused by her father. She found me hard to tolerate for being male. I was a crushing disappoint to both my parents, shy, not sporty. They liked me being 'top of the class' though. My dad basked in the glory, my mother I think, as a way of minimising the impact of her alcoholism on me. I retreated into fantasy novels, self harm and a very compartmentalised personality. I could be really cruel as a child and also sickened and disgusted when someone else was. My 'parts' I realised this year are very poorly integrated.
I really related to your points about your children. I used mine as my parents used me- to feel good about themselves. Not to the same extent and I have got better at that. I can now usually spot that thinking/imagining process (me at their great achievement award night) and shut that shit down. But sometimes I almost forget they exist. I live in a world of 'I'. That said I have in recent years been able to actually feel that I love them for who they are, not what they do. A move from the conditional to the unconditional.
I realise this is a very long post. Quite narcissistic in and of itself. I'm not sure if you are a narcissist OP. As my story shows I'm a lot more down that road than you seem to be and I'm not sure I'd get a 'diagnosis'.
I have scored myself on some of the validated measures and on the maladaptive covert narcissism scale I'm 64 - just above the 'normal' cutoff. But that's just a self report scale and I'm not sure if any DCM-V/ICD 11 label has much meaning in some ways. From my professional perspective, the concept of personality disorders come from a medical model of mental health and categorising of distress. A better view I believe is through a trauma informed lens. I've yet to meet a so called BPD/EUPD diagnosed person who didn't also have significant adverse experiences in early life. That view allows for change and growth through self awareness.
Same is true for narcissists. I appreciate some people aren't aware of the impact of their behaviours on others and may be unwilling or unable to either recognise this or drop the defence against pain and shame that narcissistic behaviours are. That makes them very damaging to others and not being around them is the right move. But OP it sounds like you are self aware and that's hugely important. I've spent well over half my life not being so and fucking up other people's lives because of it. Whilst one might have empathy for the little child who came to know his parents could not love him for himself, the adult has a choice about their behaviours. Getting pissed and kissing someone who saw me as a supportive friend was a choice I made instead of staying sober and trying to address issues in my marriage. I know now why I did it but that's not a free pass.
So where now OP?
Maybe some reading and therapy might help. Try to be kind to yourself if you can. You did nothing to deserve a childhood you needed to recover from. Be self compassionate but also be willing to work to try to change behaviours if you see them as hurting others. My mistakes in all my therapy to date have been talking about 'poor me' and 'bad me' and not trying to work on being a 'self and other aware new me'.
Very best wishes to you.