What should i do!!!

Ashley
So I'm turning 19 in 7 days, I graduate high school in 21 I know that after 21 days I will have to tell my parents I've been seeing a 24/25 year old for the past year. I just don't know how i know they will be mad bit I only hid it because of how protective and strict my dad is, how should I tell my mom first ayer I graduate that I've been seeing him.