Definitely being misunderstood by others. I know I come across as cold and distant when I don't wave or say hello as much as I probably should. I care a lot about what people think about me and I'm not able to present myself in the way I really want to. It's hard having that difference between what I feel I'm like on the inside and how I can show it. It's easy for people to mistake me for being stupid, rude or both when in reality I'm just petrified of letting go and relaxing.
Also there's the replaying of what I think were uncomfortable events over and over in my mind. It's like my brain is always switched on. I still think about things which happened over 10 years ago which, rationally, is ridiculous but I really can't help it.
To be honest I relate to everything on the poll but I still stick by that being misunderstood is the most painful for me.