totally ticked off!!

I am quite angry right now. Without going into details, let me just say that I am tired of working my butt off, giving my time and talents to something just to find out that I am not considered a part of the group. I am getting sick and tired of being used. I think I may have to take a step back and just take a break from everything for a while. I am really, really angry right now...I can't even see straight.