For newly sober people, other people DO care if we drink or not and how much. Often they simply don't understand about alcoholism and the misery it causes. I envy those people in a way for being so blissfully ignorant that alcoholism is real and causes great suffering.
But I understand exactly where you are coming from. There is plenty of support from alcoholics here and elsewhere (the AA fellowship can be great for that face-to-face support).
To family and close friends, I find it best to simply explain about the misery and suffering drinking caused; that it made me not care about anything in the world, and that I was sick and tired of feeling that way. And, it really is about the misery and suffering, not the quantities. Usually, if they care about you, they will at least learn to respect your choice, but it isn't always easy.
You are doing the right thing! A sober life is so much better than living an alcoholic's miserable lot.