Is this Karma?

I've always tried to be an honest and sincere person.
I never cheated at school or university, simply because I couldn't. I became nervous, very self conscious and got a terrible red head.

So why do people lie about me?

As a buddhist I should say it's Karma. Maybe I did something wrong in my past life and now it's time to pay for it.

A buddhist teacher had a good laugh a while ago when I said I had the feeling I was playing a role in the Karma of someone else. Without me, he could not make the choice he had to make.
This person made a huge mistake and I was the victim.

It was a strange experience, because I saw no cause at all why this person should speak bad about me.

Buddhists who are grown up in a buddhist culture are far more accepting of these situations than I am.
It's part of the suffering of life, they say.

Oh yes, suffering it is... but only because I long for the truth: that I'm OK.

How far should we go in accepting injustice?
Should we just accept that people destroy your family life because they think wrong?

Some say I just should bow my head and let happen whatever happens.
But the consequences are not right.

Some say I should stand up for the truth as long as I won't be violent and will be peaceful.
But the person who speaks ill of me feels it as a violation of his supremacy when I go against him.

So tell me, what would you do?