I always look at it like this, if I have to plan out what days I will drink, what days I won't, how many days do I need to not drink to fix tolerance, how long does it take for my liver to start to repair, etc. then that is a pretty large indicator that I need to quit drinking all together because I am an alcoholic and that is not "normal" or healthy thinking.
It is scary to think of our lives completely without our substance of choice, but the fact that it is so dear to us is even more evidence that we have an unhealthy relationship with the substance and that something needs to change. If you don't want to imagine the rest of your life without drinking then don't look at it that way, look at it as this hour I won't drink, this night I won't drink, this day I won't drink, this week I won't drink, etc. and eventually all those hours, nights, days, weeks, months, etc. will end up adding up to a lot of time without thinking about the scary NEVER AGAIN concept.