My engagement is the best/worst thing ever!!

To put it briefly, my boyfriend of 7 years proposed to me in late January. I am so happy about it, but I still haven't told a large amount of my family. I just don't know how to tell them. I don't even know how to bring it up in a conversation! I already told my mom and grandma (as they're my cosest family members), but I'm too scared to tell anyone else! I love him dearly, but I can't help but worry about how my family will react. My dad sort of accepts him, but I know he "thinks I can do better" and whatnot. I feel like it would just be another thing for him to complain about. I don't know.
I'm also stressed about how I'd answer the questions. The first thing people would ask is "where's the ring?" (it's being re-sized) and "when's the wedding?" (we still have no idea). I don't know how I'd cope in front of a large group of people during a wedding. Even a small group of people, heck I get nervous around one person if I'm the center of attention.
There's also the fact that I've waited this long to tell people. I could pretend that we only just got engaged, but I hate lying to people. I really love him and I'm not ashamed of it or anything, I just really don't want people to make a fuss. It's killing me!