PurpleOne, be honest with those friends, it may even require you to be totally ruthless and cut contact with them if you find it too difficult to refrain in their presence or they don't take you seriously. I found it helpful to use the suggestions in AA: keep sober company; stay out of pubs and clubs; don't lift the first drink; go to meetings regularly; join a group; etc. One of the most important things I think for anyone is to plan ahead, don't be caught off guard as we'll more likely to slip up and revert back to old patterns of behaviour.
The thing about control is a difficult one. I can sit here and tell each person that they are, IMO, an alcoholic or problem drinker but until they are ready and willing to admit it themselves - and more importantly so something about it, it's totally futile. Moreover, I'd just alienate people who are genuinely asking for help, who can't see where they're going wrong.
I wouldn't keep coming back to this thread if it was so easy to address alcohol problems. If it was just a case of going 'well, I'm not in control, I'd better stop' there would be no rehab, no Alcoholics Anonymous or people dying of alcohol related deaths. All I can do, as someone who has been there, is point make suggestions and try to offer support. I will be honest, and have the best of intentions, if the poster seems ready to take it to the next level.
Just because I no longer drink, and haven't for a while, doesn't mean I'm any better than anyone else. People helped me to get to where I am and the least I can do is to try and pass it on to others. My way won't be the way for everyone so I try to see it from other people's point of view. Even if it's blindingly obvious that someone is a bottom end alcoholic, it's up to them to make that life-changing decision that dealing with a drink problem requires.
I hope everyone feels they can post on here honestly, it takes a while to figure out where you are on the spectrum. Please don't be put off, it's for everyone, whatever stage their drinking it at.