Am I an idiot to be a good person who want to help people?

I had always tried to be a good helpful person. I like the "thank you" come out from people's mouths. I even would sacrifice my own benefit to help others. I like to help people and been appreciated. However, society keeps showing me that I'm wrong. Some people don't appreciate your help at all. I usually feel like an idiot! And only I take stuff seriously and help others. Maybe in other people's eyes, I am an idiot? I don't know. I really don't know.... For example, today, our school had a gifting event. Each person was assigned to give a gift to another student they randomly selected. I spent 20 dollars to buy the gift for the person I need to give to. After I showed him the gift, he didn't show a single sign of appreciation. No one gave me a gift. People didn't even take this event seriously. Should I still be nice.....? I DON'T Know!!! I really feel like an idiot!!!

You can only find comfort in being nice when you expect nothing in return. Be nice to people for your own well-being. That’s my advice.