How do I stand up to my family?

My so-called family always keeps getting in my way, treating me like I have nothing better to do instead of understanding that I do have things better to do (like tell my crush that I really like him). I can't take it anymore. How do I make them leave me alone and let me do what I want?
Update: Keep in mind, I'm unemployed and can't move out.
Update 2: And I'm over 18.
Update 3: Anything within reason.
7 answers 7