I have a lot of similar ones to yours, SD.
I always think people are talking about me or laughing at me, and if someone gives me a compliment, they are doing it ironically because they actually believe the opposite is true and they think it's funny to give the compliment about it.
I've felt like I have a special purpose in life too, ever since I was a kid, and that I am supposed to change the world somehow.
I feel like people hate me or are mad at me way more often than people probably actually even care about what I do. And I feel like people are purposely being an asshole to me when they are probably just trying to get through their day.
I have the similar feeling of being destined to be "one of the greats" in my field, which is mental health counseling. I will spend hours reading extra books and articles in addition to my classwork because I am supposed to write my own theories one day, and I need to have an excellent background of the field in order to do so. In actuality, I will be lucky to simply make it through the day of having to see 7 clients without breaking down in front of them when I manage to get a job.
I was straight up psychotic during my one manic episode... it happened while I was at a comic book convention, and I believed the Rapture was happening. Except it wasn't Jesus that came for Christians, it was aliens coming back from their planet to save the nerdy types that would go to conventions like that because they would be open to travelling with aliens. The convention centers and surrounding hotels were actually spaceships built into the ground that were designed to lift off when everyone was there. We were going to leave Earth because it was eventually going to burn out due to global warming and everyone harvesting the Earth's resources past the point of them being able to replenish. Fun times.