For I, I have a tendency to hope that those who I cared (or interested in) the most would understand me better. The problem is, whenever I tried to open up myself, I only show people certain sides of me, and hide everything else, mostly due to not wanting to let them down. Of course, this only ends up being more misunderstood from others and further letting me down.
I also happen to try to open up myself "completely," and that seem to make others feel pressured (even with close friends) as they felt tjey could be walking on egg shells if they're not careful enough with my sensitive emotions.
As far as I know, most ENFPs have this great ability to open up "partially" without risking being fully exposed, and yet others won't even suspect that they didn't open up completely to them. I consider that as an amazing gift of people's skills.
I'm still in the process of finding my way and learning how to open up to "certain" people. I know that I push people away to protect my inner self (if that makes sense) while secretly I want to open up to someone without causing them uncomfortable (damn Fe!!! :steam nor being found out or be seen completely (damn Ni!!! :steam
I honestly felt the reason why most INFJs are suffering from melancholy, self-indulgence, or self-pity is a result of failing to open up to others in a constructive manner.