Beta won't update past 1.11.0.7

I never joined the Minecraft Beta, but I noticed the sys info at the top of my screen one day that indicates I'm running 1.11.0.7.  When I went to the MS Hub Insider app, it asks me if I'd like to join the Beta. My question is: how did I get into the Beta without joining it? Also, if I go ahead and join in the MS Hub app, will I lose my old games?