A large component of emotional regulation consists of what we do with our emotions after they are generated.
Most people don’t choose how to act based on reason. Instead, they act in response to feelings formed as subconscious internal responses to their external environment:
Feeling => Reaction => Reason
For these people, reason is only used post-hoc to contrive justifications for decisions already made, typically subconsciously.
Basing your decisions on the interaction between your external environment and your subconscious emotional response to it is a terrible idea because it is so unlikely to even approach the possibilities that intentional response can.
You should never do or not do something only because of how you feel in the moment, whether those feelings are good or bad. If you operate only on what you feel, you will never undertake the conscious and deliberate effort required to attain the potential joy you can experience in life. There is a better way.
It is possible to exercise reason before acting, proactively shaping your environment, and enjoying the feelings that come from constantly doing the best you know:
Feeling => Reason => Action
In order to become more rational, it is necessary to learn to insert a separation between emotion and action. Learn the art of pausing and thinking, even in the most intense, surprising, or boring events.