Do society's values change peolpe?

ive always been kind to everyone its what id been told to do but lately i started realizing i have completely diffrent opinions about others in my head. i have terrible thoughts about really gruesome things id rather not metion. ive become really weird on the outside i snap at others and personally attack them for the slightest comment against me. so i guess my question is what if i was born to be a terrible person an evil person in eveery sense of the world but because since i was little ive been told over and over what i should do i was almost brainwashed into doing diffrent im not saying thats a bad thing but just somthin for you to think about