have you ever heard the serenity prayer? i'm not a christian, but it's concept is extremely valid. i'd like to share it.
God grant me the serenity to accept the things I cannot change,
the courage to change the things I can,
and the wisdom to know the difference.
if you think of that, or some similar jumble of words/ideas, when you get upset about something, it can help you through it.
you can't change how these people think of you and your situation. so accept it... accept that they don't know. and move on.
that's what i meant by "be the bigger person".
sorry if this advice wasn't wanted, but it's really some of the best i can give.