I definitely have a few 'issues'. I can see that they are ridiculous, yet they plague me almost daily.
One is that I often become convinced that others can read my thoughts, especially if they are within immediate proximity. I'll not allow myself to think about certain things if there are people close by, especially people who know me. I then convince myself that they are deliberately pretending not to know what I'm thinking, because they don't think I know they can read my thoughts. I find myself watching for any sign of a reaction that would prove a response to my thoughts... such as a look of ill-ease if I thought about something bad.
Another thought that plagues me often is wondering if everyone else in the world are either actors, or robots, or an illusion. The robot one seems to worry me most. I often think that the world is some sort of giant test that I am being put through, and I'm being recorded and graded on my actions.
I think this delusion came about because I didn't understand how everyone else seemed to 'know' how to behave and react in situations and I didn't. I felt like they must have been 'programmed' with all that social knowledge and the ability to cope with situations that, to me, seemed VERY stressful. And that therefore, I must be the only 'real' person, having to learn coping strategies and rules that everyone else already seemed to inately know.
I still have these feelings, but the fact that I'm posting here is proof enough that I'm able to push them back and accept they're just delusions and that other people really are real 
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~I wanna fly high, so I can reach the highest of all the heavens
Somebody will be waiting for me, so I've got to fly higher~