Please help me.

Hi. I'm briana I turned 16 may 8th. I don't know how to tell my parents I'm pregnant. (Yes I no I'm so young to have a kid. My sister told me that to many times.)  My boyfriend and my older sister knows. however, I was thinking of writing a letter but I don't think they would like for me to do that. I really need help. 😔 please help me. Thank you.