Sage

He speaks the truth. It sounds from your post that you just need someone to talk to. Set up an appointment with the counselor at your school and just talk to them about how you feel and what's going on in your life. You're not a horrible person, you're not "unworthy," and you most certianly shouldn't be feeling bad about being nice to people.

You have to realize that EVERYONE chooses their reactions to things. Perhaps by opening that door for that girl, it drove home to her the fact that she's never really been loved by anyone and never had anyone to open doors for her. She retaliates by lashing out. The guy that you waved to? Perhaps he's secretly harboring homosexual feelings and is terrified that someone would find out- so having a guy wave at him in a public place was a realization of those fears. I find that if people have non-standard reactions to things that are generally seen as being polite, then the person who has the reaction has some seriously screwed up things in their head.

Also, realize that you don't have to take humanity's burden upon yourself. Hell, you shouldn't even be concerned about it. With the building of self confidence, you'll be able to say "well, fuck you too!" whenever anyone is an ass to you, but because you won't be turning into an asshole yourself you won't actually say it out loud (thus adding to the overall sense of assholeishness in the world).

Keep it up, because whether or not you realize it, it has a huge effect. Trust me

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