"I am just 18 years old…so maybe i am wrong in some instances. "
Don’t worry, I can guarantee you that you will be stunned to see how much both you and your elders will learn over the next decade and beyond.
That you worry about the plight of children says some positive things about you. A tiny suggestion; perhaps concentrate your concerns on things about which you can actually do something–and then do it. Need not be dramatic, or a huge thing. Possibly begin with small acts of kindness and compassion.
In my experience, the world is certainly changing quickly, as it has done all of my life. As for people; not so much. I see the same cast of characters I’ve always seen. Most people seem to be neither especially good nor especially bad. There is always a sprinkling of people who seem to be very good people, and people who seem to be very bad. Very occasionally, you get saintly people and you get truly evil people. Fortunately, I think the saintly people vastly outnumber the truly evil.