My parents think it's stupid for me to help others, what's wrong with helping others?

My own parents and others in the family criticized me whenever I decide to help others. They think I should only be focusing on helping my family, not others. I'm already supportive with my family and close friends. Sometimes I still have additional time to help others. Another thing my parents keep asking me is this ''But seriously who gives you money anyways''. No one but I just like helping when I have a chance too.

For instance I gave donation to some lady whose child had cancer. No one in my family has an illnesses and I have no first hand experience either. I just happened to be available and if it's in my hands to help someone at that moment, why not?

My parents and those criticizing me remind of the people that couldn't care less if something happens to others but suddenly care if it happened to them directly then they would create a foundating, asking others to help so it doesn't happen to others. What's so bad about helping random people?

Updates
3 mo
They all think it's none of my business and to let others solve their own issues. But if I can help out at that moment and maybe make a difference to that person (maybe they needed that bit of money for an important surgery or something and I just happen to be there at that moment)... why not?
My parents think it's stupid for me to help others, what's wrong with helping others?
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