This is something I think about a lot. Which is why I'm back on the wagon after over a year off. I always think that because I don't drink in the morning (typically) and can go weeks without drinking that I don't have a problem.
That is the alcoholic voice talking.
The fact is, alcohol and drugs have jeopardized my life (and the lives of others) in so many ways. I've lost jobs due to alcohol, shirked responsibilities, exposed my children to crazy and reckless behavior, made a fool of myself, driven drunk, raged, acted irresponsibly, become suicidal etc etc etc etc. All due to alcohol. This is not the case for normal drinkers.
It's not a competition. If you have a problem with alcohol or drugs, you know it, and it's up to you to stop.