I wouldn't worry about your friends not living up to their potential. It sounds like you are doing well on track with things, and you should stay focused on your goals. Adding some new sober friends (or friends with common interest) may be helpful.
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"Do you know someone you would like to change and regulate and improve? Good! That is fine. I am all in favor of it, But why not begin on yourself? From a purely selfish standpoint, that is a lot more profitable than trying to improve others - yes, and a lot less dangerous." – Dale Carnegie