Hi Catherine!
I understand what you mean becasue for me pinning down who I am and who I am not has been one of the hardest things I have ever chosen to do. As you say it does change according to situation and I can't imagine anyone who can possibly be 'who they really are' 100% of the time - or maybe you could define that as madness
I guess for me, I think I found who I really am by finding the place that I truely feel free from all worries, problems and interference. When I feel free from everything that influences me then I have truely found who I am - the core of 'me'. In any other situation my core 'me' is influenced to some greater or lesser extent. One of the problems with finding who your 'core me' is, is of course if you are happy with who that person it. But of course, if you never find who your 'core me' is, how can you ever change it?
By finding what I believe is the core 'me', I can work out what influences me and then question why - it is the awareness to me that is important, it doens't necessarily mean I need or have to change. For example, I am aware that I worry about what people think about me and so I know when I work with a horse in front of people I am being influenced by their presence and moving away from being my real self. I am working on this situation but in the mean time, I know that if I want to work with a horse at my best, I have to be on my own or with someone who I can really trust.
I also sympathise with people not always seeing the changes in you, although in a way I quite like it becasue it means I worry less about whether people see changes in me or not an what they think of the changes. My mum is adamant that I am the same person who used to throw herself over her child safety gate in temper and Dave is adamant that I am still the same person who he went to school with - although to give him credit he has noticed that I never stut up now and I was quiet at school!
I hope I make sense
Marie x