I find that the times when I really dwell on my feelings and life and sadness and whatnot are times when I am not being stimulated and have entirely too much time on my hands. I am happiest when I am working towards a goal, enjoying the process and witnessing results. I think, maybe, you need more tangible, intellectual stimulation. I think you are dissatisfied with your life because you are above all else...bored. I know these things are more complicated than that, but I am a big fan of Occam's Razor and try to apply it whenever possible. Also, I, like you, am and ENFP so I thought I could provide some insight.