For what it is worth @Teej I don't think you have bugger all personality or an identity deficit. I actually see you as a very humourus and self aware person. Although you struggle at times with where you are sitting in your life - you do continue to connect here and it is often not only with wisdom but also with care - that further shows us who you are.
So much of our identity is formed when younger and if we have been through trauma it can make us feel like we have lost what we could have been rather than identifying who we are now - some of that is as a result of what we have been through but it also - I think - gives us more empathy ...and that you certainly have.
I have no doubt that you are second guessing your positives right now and letting that negative mind take over - but I am also sure that all of us here can see your positives - because they are many 