Negative thoughts. What should i do?

I am obsessed with sexual thoughts, i just make those thoughts when i am free from childhood, i am obsessed with negative outcomes, i always make negative stories in my head, whole day my mind is stressed, not pain but feels heavy due to stress, don't have any goal, but since i was a kid i had a dream to do something big in my life. I daydream too much. I sometimes afraid of speaking due to stuttering. I have variety of obsessions. But all mental. Few of my obsessions are over like religious ocd and hocd. If someone mocks me like in a fun way(nothing bad), it makes me feel like they are trying to make me look lower than them and that makes stories in my head and makes me aggressive and angry. I ruminate those stuffs. What should i do?