Let’s be real: most people don’t help others in need even when they are able to. People who donate to St Jude Children’s Research Hospital or volunteer with homeless people do so for performative reasons or to just look good in front of someone; in the end, they are doing so for their own self-interest.
You are kind of right but your focus is way too narrow and short-sighted. The better off people around me are, the better off I am. Society is what brings me the comforts and freedoms I have today. Without society I would likely be some peasant living in a hut and trying to farm some desolate piece of land until I died at a very early age.
By donating to medical research, I am able to improve medical care for all, and that includes myself. By donating to the arts I get to see art that I would have never been able to see otherwise. By donating to the poor and things like education, I reduce crime and violence where I live.
So yeah, basically everything you do is self-serving, just try not to be such a basic bitch about the scope of your actions.