telling my parents

I'm 16 and in a couple of days time my boyfriend and I will be celebrating our 2 years, we waiters a really long time before we though about having Sex, after about 8 months of being together and talking about from 6 months into the relationship we did it, we haven't told out parents at all. I want to tell my parents because I think it's the right thing to do and I'm tired of being so secrative about it and I just want to be able to sleep with him at night in the same bed and be able to do it freely. Does anybody know how I should tell my parents?