What is moral is what you feel good after, and what is immoral is what you feel bad after.
As trivial as it may seem, it is often difficult to tell the difference between right and wrong. Most judgments are complicated, and as reasoning beings, we have the ability to build a case in support of anything we want. No collection of facts or logical arguments will ever really prove if something is right or wrong.
So what do we do? Don’t try and push your mind for an answer it doesn’t have. Rely on your intuition. How does something make you feel? Our subconscious mind processes much more than our conscious mind, but instead of producing logical thoughts, it creates emotions. Learn to trust these emotions and they’ll prove you to be wiser than you believe.