Hi Matt - My opinion is that some family members can be as toxic as the booze, so don't tell them. As far as friends, tell 'em you've started to develope an ulcer - Jeez, who'da thought??!! Then, down the line when you're proud of your success you may want to share with some close buds.
The decisions you're making and the actions you're taking right now are all about you; don't weight yourself down with worry about what others think.