toptramp - I could be your sister (well, apart from the high-flying career bit
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If you spoke to me and my sister about our childhoods you could be forgiven for thinking that we were brought up in different families.
I was lucky that all things academic came easily to me, whereas my sister worked 10x harder but with less success (though she still did more than good enough and it was actually very unfair of our parents to compare us in the way that they did).
I was allowed to do things younger than my sister (typical of the second child) and afforded more flexible boundaries.
She had a disastrous abusive, 6-month marriage at 21 (she'd been with him since 17). I am ashamed to say that when the marriage split, I blamed it all on her and added to her grief when I should have been supporting her.
She was also on ADs.
Meanwhile, I was on course to graduate with top class honours and seemed set for a wonderful life.
Our mother died in the aftermath of this, which compounded my sister's 'guilt' in having 'let everyone down' (she didn't - we let her down - but it has taken her years to see this) and never got to see her rebuild her life (she is now happily married to a wonderful guy and has emigrated to another country).
We are closer now than at any time in our lives. The turning point was having children. It gave us an empathy for each other that hadn't been there before, and once we started talking, all sorts of things came out (like the fact that her marriage had been abusive). It was very uncomfortable for me, because I realised how low she'd been (she'd been on ADs for a while) and how unsupportive and actually adding to her problems I'd been. Needless to say, I apologised unreservedly. I can't undo my behaviour in the past, but I have definitely learned from it.
A few years later, I managed to take up with an abusive man myself and end up a homeless single mother. Being quite lucky and financially independent, this didn't hold me back for long, but it also made me realise a few things about how abusive relationships work and it taught me the value of humility. There are a lot of us out there who think that "that sort of thing will never happen to me" whereas I've realised that life is "there but for the grace of god". We are all only one car-crash/job-redundancy/psycopath away from having our lives changed forever.
The balance in our relationship has changed because I have acknowledged her past hurts and we both now realise that neither of us is 'better' than the other. We have had different lives but we choose to be supportive rather than judgemental and take joy in each other's achievements rather than being competitive about them.
How is your relationship with your sister now? If she can be a positive influence in your life, it will help enormously, but you can still change things without your sister's involvement if she continues to be judgemental (my sister started her recovery long before my turnaround).
My sister got counselling, which helped enormously, but the upshot of that was to concentrate on her strengths and assets and to work towards something that would give her a sense of achievement (which doesn't have to be employment related at all). Always remember that the flip side of a great career is that you can lose your identity. You become the 'banker' or the 'Dr' and when people ask you to describe yourself in terms that don't include your job you can find it almost impossible to do so... Whereas you are in a position of making an impression on people solely because of who you are - your personality. You sound like a thinker, with empathy, a person who is quick to accept responsibility and someone who refuses to be held down even when the cards are stacked against her. Can you see how admirable that is? Add in some hobbies and interests and your own unique idiosyncracies and you are definitely a person worth knowing and a person worthy of respect in your own right. How you measure up to anyone else is completely irrelevant.
Sorry for the essay. I hope some of it is helpful. 