Is it normal to think family is plotting against me? (murder and other violence)

I love my family, but I feel as though they want to kill me, rape me, gaslight me, assault me and generally ensure my happiness is but a mere memory.
My family has no history of doing things like this. The meanest thing my family has done is normal sibling stuff, and once after finding out I self-harmed again, my mother forced me to clean the house. (It really hurt because one of the things I used to harm myself was a scrubby pad, which my mother would have made me use had it not been for the fact that 'there was probably blood on it.' Bit of a tangent...)

I get into bouts where I feel the need to expect to be killed. It may be because of an inactive mind, as it usually happens at night and in car rides. Either way, they feel very odd.