What kind of job could I get into?

I love kids and older people. Pretty much I love everyone. I REALLY want to help out others. I want to make people aware. I was thinking a teacher but then I thought that didn't help enough. Then I was thinking a police officer, but that might just be too risky. I want to make the world a better place, I know I can't do that, but I want to help and then spread the word to others to be better people. I can't really go into the medical field cause I have a weak immunity. Any ideas? Doesn't matter what kind of training, or college, I just need some ideas. Thank you (: