Since around the beginning of the school year I have found it impossible to think straight or focus. I have serious motivation problems, but even after I do manage to sit down to do work my mind will be entirely blank and I can't think of anything. I have managed, but it makes it much harder to do well in school.
I also have problems with intrusive thoughts. I have body dysphoria to the effect of the idea of reproduction, and I often am taunted by thoughts and feelings of being touched sexually and of Another thought is of people telling me I'm worthless. I am not insecure at all, so these thoughts normally wouldn't bother me, but recently I just get the feeling of people yelling at me very often.
More recently, something else has also arrised. Often, I will either through anxiety or boredom become very uneasy and paranoid. When I am around my sister and this happens she says I'm acting crazy. It becomes very difficult to speak coherently or collect my thoughts, and I can't get a solid grasp on my surroundings. Though I remember it afterwards, when I snap back into reality many of the thoughts I may have had seem incoherent and unrealistic. This doesn't disrupt my life as much, but it does my relationship with my sister.

How much of this is normal? If anyone knows of ways to cope with motivation or these kinds of thoughts, please tell me. Thank you.