I totally agree with #1 - I was told and still being told the same thing. It's for me to decide I have a drinking problem.
#2: Why would someone take it personally that YOU don't want to drink anymore? If you not drinking affects the friendship, was it really a friendship?
#3: Until you are ready to proceed in putting yourself into a situation involving temptation, do you really care? See #2
My friends support my decision 100% and actually look after me when I am out. It will take some time before your friends are on board with it - maybe. So as long as you make it known that you cannot drink and ask for their support and compassion, real friends will be there for you.