I agree,but John has stated that he's bipolar.
Myself, I'm unipolar chronic major. So I get all the lows with none of the highs. When the black pit opens under my feet I become totally useless. I also don't react to good things happening the way most people do. I never jumped for joy when I sold a piece. When I heard one of my best guitars played by the client, an excellent classical player and old friend, for the first time at Carnegie Recital Hall, I felt no great sense of accomplishment. There are exceptions, but they've been few and far between. Falling in love, that I enjoyed, hence I've had a lot of girlfriends but only one, my current, really long term. Twenty-four years. The previous record was nine.
On the other hand I am indeed deeply emotional, often to the point of having no control over it. My sweetie is excellent at separating her mind from her emotions, which is very difficult for me. I often feel overloaded by stimuli. There's only so much I can take. This might have something to do with my limited capacity for enjoyment.