M.C.
Hi M.!
When my boys were the same age ( they are 2.5 years apart), we already had this conversation - but its not too late for you. Here's what I did.
I sat down with them separately and told them that everything they are going through is new to me, and I don't know how I'm going to handle things. There are going to be situations I don't like, there may be times that I need to snoop, or ask REALLY personal questions or other things I haven't thought of yet. AND>> Until I'm okay with this whole teenage, growing up thing, you're going to just have to deal with me and my phobias and be nice to me and do what I need them to do until I am ok, and I promise to let you know as soon as I am, and I promise it won't last forever.
This worked so well for me. We went through friends, girls, dating, jobs, college life and more. My boys talk to me about everything because I never freaked out (in front of them!!), NO SURPRISES and boy, am I happy! They are 20 and almost 18. They think I'm a freak and I wouldn't have it any other way.
Good luck.