Have you read The Power of Introverts? (I haven't, I just find it fascinating )

I like this thread. You are helping people even as you write about your own troubles.

I agree that sometimes visionaries or people who have attempted to do great things haven't been really understood.
If you're super-intelligent (and it sounds like you might be, since you occasionally lecture?) you may be even more lonely if you don't have people of your intelligence around you.

I admire you for lecturing/teaching, I tried it and saw it wasn't a good fit for me (at least in primary and secondary school) I hear even kids at university aren't anymore what they used to be. It must be hard teaching a generation used to Facebook, computer games and instant gratification and copy-pasting...

Expecting gratitude when you do good things is kinda natural, though it's better if you don't expect it... (and then you can be sometimes pleasantly surprised ) I believe in good karma returning if you do something good, somewhere else usually you get something good too, even if not from that same person...