How to Navigate the World With the System of Ethics

I don't know if I believe in real ethical obligations than I guess, or if I could like objectively say like someone ought to have some sort of ethical obligation. It just sort of describes why I happen to feel like I want to. So when I think for instance of that island example, if I was somebody that was of the idea that like I can make absolute moral statements and I could tell this other person like, hey, you can't bully me or steal my food or kill me because that would be wrong. And if the other person disagrees with me, then well, I'm, I'm in a lot of trouble. My moral statements don't really serve me very well.