What to do when my cousins know everything about me cause they can access my fb profile?

Ok, I have a facebook and i have added all my family( cousins and uncles and aunts.) And I hate how they know everything about my life since its on my profile. I'm about to have a girlfriend so if i put in a relationship all my family will know. But i don't want them to. What do i do? And were pretty much always together so if i block them theyll get mad and everyday i seee them.