If you want to go to a meeting you have nothing to lose.. whats 1 hour of meeting new people , when your off your head for hours then going on a downer.
Just try and stay positive and believe in your self. Try and go out with people that dont use or family that dont.
I wouldnt worry about not being liked. Your there for help, and there is always someone else who has a worse story than yours, and your there to help people aswell. Thats part of recovery, to help each other. Dont worry about confidence. Majority of people there wont have confidence, i havent. Id go to one. But its hard working it around work and that.
If you feel lonely because you now have cut people off. Try new things now. Whether you are confident or not, and good things will eventually come to you. Just believe in yourself. Just get past that 1st hurdle.