Why am i turned on by everything you could ever think of?

I literally get turned on by anything and everything even the sickest thing you can think of. Besides things having to do with poop or blood. I know this isn't normal. But it truly bothers me and I don't know how to stop all these thoughts. What do you think is wrong w me also what do you think I should do to help me stop thinking of really negative things. Sometbing tells me it has a lot to do w my past. I don't remember much of my childhood at all. I didn't live w my parents since the age of 3. I also get extremely turned on when a girls face looks so innocent and when girls cry in pain