Its a lifestyle choice, and not just drinking, there's smoking, eating the wrong things etc. Most of the things we do are habit and for some its harder than others to give up or even moderate things we enjoy doing.
As far as I'm concerned I am a moderate social drinker and my palate has changed so I no longer enjoy most wines though enjoy a glass of good wine. It would be easy therefore for me to give up drinking but less so other things I enjoy. Its not so easy for some even when given an ultimatum, so telling everyone you have stopped is probably a good thing and part of a positive mental attitude!
Good luck and keep us posted on your progress!
