Is it strange that I get stressed out watching videos of people doing nice deeds? It feels super awkward.
Why do you get stressed over that?
I feel like others will judge me harshly, saying I'm a cold and selfish person
I don't think your cold and selfish. However, I do think it's important that you try and learn to be happy for others when people do nice deeds for them.
Yup, I better hide the internet or I will get stressed out.
You may get stressed out if it's something that you don't relate to and that is understandable. However, you can use those videos as an example of how you can interact with others in a kind way.