I can’t tell anyone

My boyfriend and I are 17. We have been dating for 3 years now. Our relationship started getting more physical. Today he touched me and fingered me for the first time. It was so different than any time I have touched myself, not in a bad way though. I am not upset at all that it happened, but I feel like I can’t tell anyone. So many people are going to tell me that I’m “too young.” I especially can’t tell anybody in my family. Nobody can keep a secret, and if it got to my parents or grandparents I’d never be allowed to see my boyfriend again. I just wish that I could share this with my friends, but I don’t know what they would think about it. I guess I just needed to tell someone. It happened, and I’m kind of happy it did.