I want to encourage you to be as selfish as you possibly can.
How can I encourage that?
Well, Jesuit priest Anthony De Mello, in his book "Awareness: The Perils and Opportunities of Reality," describes three kinds of selfishness: giving yourself the pleasure of pleasing yourself (self-centeredness), giving yourself the pleasure of pleasing others, and doing something you don't want to be doing so that you won't feel bad (codependence).
Let's just focus on the selfishness of pleasing others.
Maybe this doesn't fit perfectly with the definition of selfishness, but bear with me. Almost everyone I know who is involved in charity gets a benefit from it. Selfless acts are concomitantly self-interested.
That is a good thing. Being generous because it feels good can be a strong motivation and knowing we are getting something from our generosity keeps us humble.
When we do something for others we feel better about ourselves.
This year, our company served meals at the Simpson Housing shelter for those experiencing homelessness. We had to do it in various shifts because of the size of our group, but we generally had similar experiences.