How Can One Person Change the World?

I look at everything around me and ask myself "am I happy"? Not really, it saddens me what I see on a daily basis. I'm constantly being bombarded with photos of animal and child neglect and abuse. I'm constantly seeing people choosing money over ethics. I'm constantly watching my environment be destroyed. I see sadness and rage in so many people and I don't understand how people just accept this as normal. People need people, love, kindness, caring, affection, etc. Not money or things. We need to spend time with our families, we need clean air, we need clean water, so why are we ok with destroying all this? Where do I even start changing this? And who the heck is going to listen to me anyway? I guess I can only start one act of kindness at a time, until I figure this out.