For me, my #1 trait that I notice (and suffer with) is my procrastination/lack of will power/inertia. I always have ideas or plans in my mind 'oh I really better do that', and it doesn't happen, and I don't know why its so damned almost impossible to make myself do something and break away from the more pointless things that I stay focused on for hours (like the internet). I need a serious re-training, but I don't know where to go for that.
I guess obsession comes next, because its all I think about and all I want to do with my life, made even easier to focus on since all sorts of different hobbies can be associated with it. But I don't talk about it outloud ever really, and I don't talk about it to anyone usually unless they are also huge fans, and then I really enjoy those conversations more than other conversations with anyone else.
Socialising is also a very big challenge for me, I'm just really shy and don't know how to meet people, and I don't seem enthusiastic to them (in person).