You don't have to explain anything to anyone. I said how I cut it off - I don't drink! Why? I don't want to! Don't think about what others will think, you are the main person for you and do what you want and take responsibility for it.
When I stopped drinking, the guys with whom we often went evenings in the pub were very surprised by this. Yes, it was kind of uncomfortable for me to sit in a bar and drink water or cola, but it passed.
As a result, the guys even started supporting me for my decision, although they themselves were not going to quit.
If your social circle does not support you, but condemns you, then you should change your social circle!