I'm sorry you are struggling with this. Honestly I don't know what this is all about. And I wouldn't even attempt to suggest what kind of diagnosis a mental health professional might give you. (By the way, my personal, non-professional opinion is that it's unlikely you caused your sister to start masturbating. Girls learn to do that perfectly well all on their own... just as boys do...)

I don't know if you see a mental health professional. But, from my perspective, that is what you need to be doing if you want to get to the bottom of what's going on with you... as much as is possible. It may be that all of this is simply something for which there is no explanation though. And, realistically, what you can hope to accomplish is not so much understanding why this developed but rather figuring out ways to cope with it successfully.

I myself am in that situation. I've fought a lifelong struggle with gender identity dysphoria along with a bunch of other stuff. I have no idea what caused me to have the problems I've had & no hope of ever understanding it. All I can do is to cope with it day-to-day.

You mentioned you sometimes hurt yourself because you get turned on & it bothers you. Plus you wrote that you fear you could do something bad or inappropriate to animals & you don't like to look at or breathe close to people for fear they may consider your actions as inappropriate or sexual. Clearly you are suffering with all of this. So I think that you really need to seek some kind of professional mental health services for this. I know you mentioned English is not your native language. I don't know where you live, of course, or what's available to you in terms of mental health services. But I believe mental health services are the way to go if you can access them.

I can't recall if I've replied to any of your previous posts or, if I did, if I mentioned the practice of compassionate abiding. It's not a cure. But it helps me to cope with my own intrusive thoughts. Here's a link to a description of the practice:

https://mindsetdoc.wordpress.com/201...e-abiding-101/

My best wishes to you...