What if your resolve to stay sober is still wishy-washy? After a single week that would not be surprising, it would also be totally okay. Think of the reasons why you are choosing sobriety, are they more important than proving you have a certain amount of willpower? Just something to consider. Sobriety is not easy, but it is definitely worth it.
P.S. Alcohol abuse is a form of living a life of avoidance.