Remember, you are not responsible for all this. She is not a people person, you are. I am not a people person but if I have to I can talk to anyone. This tooks decades.

The jealousy, ideation, and self harm are all signs that she needs someone to talk to. A lot of therapy is not "fixing you". Most of it is figuring out how you can be you in the world. How to adapt. There is another part where the therapist does call you out and point out that your opinion or thoughts about a situation are probably off and you need to re-orient your thinking. They usually do it in a nice and non-threatening way.