I can't stand my family anymore

Me and my family used to be very close, but since past 2 years things have gradually changed. They don't understand me, I'm trying to finally know who I am and what I'm capable of (I'm seventeen by the way). All my life my family made me feel worried about the world, about unkown people. I have just a few friends that I don't even consider as friends since I tell nothing about my feelings for them. My cousin did an exchange last year and my family kept talking about how brave she was and how I wouldn't be brave enough to do it, since I would miss them and I don't know how to do things by myself. All I thought was that I wouldn't miss them as much as before and how I wanted to know what I am able to do by myself. They don't care about me as much as before. And since I live in Brazil, I'll go to college this year, but I'll keep living at my home. I'm so confused, I just wish they would stop yelling at me all the time. They can be sweet for some hours and them be total jerks by the whole week.