Since when is it bad to keep your private life out of Facebook?

[Longwaytogo]

My boyfriend proposed to me last week and I started telling my closed ones. Everyone is happy but many of my friends told me it’s weird that I don’t want to announce it on Facebook. I like to keep my personal life out of social media. What’s wrong with it? Also, we plan to elope to a nice island because we’re not into big weddings. We just want to have a nice time on a gorgeous island, just the two of us after going to city hall. I don’t even care that much for the dress. My best friend told me I was weird because every woman dreams of a traditional princess wedding with a nice gown. I never did. I like going to nice big weddings but they are not for me. Why am I being called weird?
I have a Facebook because I work as a social media manager. I mostly post stuff about interesting articles or artistic things I like. I have a few photos with my friends but anything about my personal life is out of it.