My parents say I express my self to much . How can I control expressing ?

I'm a teenager . And well I would HATE my mom to stress on having a child with to many problems . So anything I felt I wrote it on facebook or my blog . But everything i wrte my mom or dad or siblings say I'm 2faced because I'm different at home then with my friend . I'm me with my friends . How can I express my self without putting everything out there ? I hate when I make my family feel ashamed .... ?? Some one please help me ASAP, ! Anything will help .