How do you deal with these mindgames?

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Man, I would like do know how to deal with some situations.

Some people in my family since childhood try to make me feel inferior to their sons/ sisters.
So they create situations like call us (father, mother, other people who live with us and me) to birthdays or some parties that they do.
When we are there, they treat us different of others, like they treat others better than us (even people that aren't of our family) and don't even present us to their friends, so we feel isolated and when I stick in my place and stay there, on the other day they call on the phone to other people that they tried to present me to people (obviously lie).
I even knew that they made jokes about me for their friends when they were far from us in a isolated place in the party. They always do this, and we try to not say bad things about them because we don't want problems, we try to be peaceful but I'm sick of this shit.

I've tried to don't go to their reunions/ parties, etc but they always say to their friends that I'm antisocial/ retarded/ strange. But if I go, they don't present me nobody of their friends and treat me with disdain so I feel isolated and people maybe thinks that I'm arrogant or strange.

Seriously, what the fuck am I supposed to do?

Thanks!