I am a moral nihilist, which in my view doesn't mean I am amoral but that all morals untimately are a matter of personal feelings. IOW there's really no rational, logical, scientific justification for an absolute moral position.
While we may attempt to find an rational excuse to justify a moral position it really comes down to a feeling about what is right and what is wrong.
So my morals - sense of what is right and wrong behavior in the moment, as I see it, is based on my feelings at that moment. My feelings can change. My morals can change.
IMO, we can't always 100% know the source of our feelings, therefore we can't always know 100% why we feel some things are right and some things are wrong.