What do you think about Socialism and Capitalism?

Hi, I firstly say that I'm a 15 years old french boy, that's why I want to know your opinion on it: I hate capitalism because from what I see and know, I find it execrable! People are selfish, only think of themselves and if you struggle, they just let you die in the street. It is more economically viable, maybe, but what is money if only 3% get way more than they need and the others die? Maybe I'm exaggerating, but I find socialism and communism way better in the way that they help people and they think less about money and more about human. Even if I don't like current socialist countries because they are dictatorships. And when I tell to people that I prefer socialism and communism, they tell me that it is just too idealistic.. what do you think? Can Capitalism be less shity and communism more viable? How would it be possible to have a democratic socialist/communist state? Thanks for helping a bit lost 15 years old guy lol.