Alcohol isn't for everyone, and it certainly isn't a "healthy life choice." So don't feel like you are lame or unexciting because you don't want to drink. Understanding your own reasons not to drink will help you say no in even the trickiest situations.  If you've made a decision not to drink, for whatever reason, stick to it. "Just one drink" is often the recipe for an unpleasant night. You do not owe anyone an explanation for why you don't want to drink. Alcohol is a recreational drug, not a way of life or philosophy. If you don't want to drink, then so be it. Going to bars or house parties is like asking for temptation, especially if you are trying to quit drinking or are easily pressured. Suggest alternative events for your friends, find new places to hang out, and try and plan activities to do other than just sitting and drinking.  You do not have to avoid all people who drink. Rather, make sure there won't be a strong drinking culture that could tempt you or lead others to pressure you to "join the gang." Let your close friends know in advance that you are not drinking. Let them know why and ask them to help you stay sober so that they are on your side before the party starts. When someone asks if you'd like a drink,the best response is a simple, firm "No thank you." While this should be enough, oftentimes people will push you for an explanation or reason, or will plead with you to have a drink with them. You want a quick, direct, and honest "no" ready when offered. Make sure you make good eye contact and say your words clearly and firmly:  "I don't drink anymore, thank you." "I'm the designated driver tonight." "I'm allergic to alcohol!" is a great, joking way to lighten the mood when refusing. This is often enough to convince people not to ask you to drink. It doesn't matter what it is, but sodas and other fizzy drinks are often great ways to imply that you're drinking without actually imbibing.  Talk to the bartender ahead of time and let him know that you won't be drinking alcohol. Tip him/her...

How would you rephrase that briefly using Chinese?
相信自己不喝酒的决定。 避开经常要喝酒的场合。 学会迅速、自信地拒绝别人。 手上拿一杯其它饮料。 找“喝醉”以外的其它事情做。 如果周围的人一直逼你喝酒，你的压力很大，那就离开吧。 设法避开诱惑。