In my opinion, there is nothing wrong with being a bit angry or jealous sometimes.
You shouldn’t throw your rage at the people around you or let your actions be driven by anger alone. But there are a lot of things one can very justly be angry about. I would even argue that some things one should feel angry about. Like when someone is mistreated.
Denying yourself negative emotions is not entirely healthy in my opinion, it’s more about the way you act on them (or don’t act on them).
This is it. The day has come. This is my chance to rickroll the entire world in one go.