Sex and parents

Maddie • I'm still young I just want to try and get some advice for things I'm struggling with and try to help others out :)
So I'm 16 and I am not a Virgin but I don't know if I'm comfortable telling my parents, as I'm scared they will be disappointed in me. I've been going out with my boyfriend for 3 years now and I just don't want them to think bad of me :(