Well, I know that feeling from other games. In every other game my guild/FC started doing other things like raiding, extreme farming and playing other games.
As long as they saw some advantage in me, they talked to me.
Was always the same shit, like, "Oh, could you make me some gear, weapons, etc.", "Could you lend me some money?", "Could you please do Dungeon XYZ so my character can level up faster?"
And stuff like that further.
The moment I said no, they moved on. I've always done so much for them, I've given them gear, weapons, jewelry, minions, mounts, houses...what I couldn't craft I've bought.
I even helped them level their characters. But when I asked for help, they all didn't have time.
I thought I'd never learn my lesson until I got to Final Fantasy 14...
I've never had a friend here, never had an FC, ignored all FC invites and will never join one.
Never helped anyone again, never added anyone to my friends list, never talked to players about me.
And I have no regrets. I come online when I want, I go offline when I want. When I Login there is no one bothering me with questions or stupid stories about his/her life.
Set your priorities and don't care about others. Then you won't be disappointed anymore.