Hi Robyn, I have been having similar feelings recently....
What exactly do you mean by depersonalisation/derealisation? What are the symptoms?...
It seems to me that you are trying too hard to find yourself when if fact you are already yourself! Know that all of those thoughts about who you are not true and they are JUST THOUGHTS, on going process of relating / analysing / judging. You could never be a thought... Stop trying to figure out, over analyse or fight these feelings, or your just going to end up in a rut of struggle... Love yourself, accept and watch your thoughts rather than treating them so seriously...
I would recommend reading Eckhart Tolle - 'The Power Of Now.' Look into 'EFT' (Emotional Freedom Technique), Try a book called 'Get Out Of Your Mind and into your Life, Search 'The Sedona Method' and consider Holosync (
Welcome!) but be warned your condition may worsen before you get better if you use it - It's very powerful meditation and not to be taken lightly so let me know if you are considering it and I’ll advise you best I can... These are a few things I have had sucesses with and may work for you!
You can get through this and come out a better, stronger person....
All the best...