Pity Party

So I'm having myself a pity party this early in the morning. I'll just jump right to it. Basically, why do I feel like I do what I can to help everyone around me but it is NEVER reciprocated. Examples:
I have friends who ask me legal questions all the time. And no matter how boring, basic, random or dumb I try to give them my best answer. So I have a class assignment to do an attorney/client contract. I send out an email to my "friends" to ask for some help with the language. I have not gotten one single response. Not an "I don't know", I can't remember", "Kiss my a*%, you crazy B@$#h", not nada. OK....
So I try to volunteer at work for whatever I can, from Celebration Committee, to Move Coordinator, to answering the phone since we have no receptionist. Every new case that comes in goes to me, not my equal co-worker who once argued with me about getting her share of the cases, oh know, she is too "busy" to take new cases, which of course is part of her job.
A friend of mine asks me to babysit her 3-year-old so that she can have a much needed adult night out. I said yes mostly because as an ex-single-parent I totally understand what that feels like. But now that my mom is half-way across the world, I never get a much needed adult night out either.
I try to help the teachers at my son's school as much as I can. They call me when he gets in trouble, I re-enforce the rules at home, I come up to the school and keep in constant contact with all of his teachers. His behavior is so far out of control that now I need them to do what I ask. I sent an urgent email with a plea, "begging" for help. Not a peep back from anyone.

I believe a few things, here are two:
"It is better to give than to receive"
"What goes around, comes around"

So what gives?!!