I consulted a psychiatrist a few days back and she said most probably I have BPD comorbid ADHD. She thinks I could be having ADHD because I don't stick to a hobby, but I don't understand if it's a part of my identity disturbance or an ADHD thing.

I feel like I don't really know how and where do I fit in. My hobbies change when I stop identifying with them or get completely bored of them. My career goals change because I feel like a different person at different periods of time. One moment I feel like the best person, other times I will be crashing and hating myself to the point of wanting death. I don't have a specific sense of self, it is changing, quite often and completely. Like there is no part inside that I could cling to or know that it is me. It is too easy for me to switch into anything, anytime. I base my interests usually around my fp. When I was in a relationship, my fp loved Paris and although I never really thought of that place, somehow I started finding myself weirdly inclined and homely towards Paris like that is it. I found my place, and I started planning and preparing to move there through a different career or goals or changing universities different from what I planned for before my fp, not exactly because I could stay with my fp but mostly because that place became my identity and started playing a big role in my whole self. Now that the relationship is gone, all I have left is the admiration for the place, no sense of belonging anymore. It is a weird feeling but hard to explain. Before my fp I thought I am someone who would never learn to cook or be a person who cooks terribly but in her influence, I put myself so much into it that I wanted to be great at cooking and I became, I  learnt. Not just as in interest but as a person, I felt myself change because it was not just as a hobby but something from inside that made me this or that person. As if my identity is objects and people and places from outside, just a momentary thing until I find a new one. My whole sense revolves around my fp, newfound obsessions, favourite characters, but never anything from inside of me.  

Is this a kind of lack of identity? How does it feel for you?