I know how you feel. The good news is, you ARE good enough. More than good enough, even. Don't confuse not being powerful enough to control someone else's addiction with not being good enough or worthy of a loving, present partner.
When I speak of detachment I mean all three plus one -- mental, emotional, financial, and even physical when necessary. It's almost impossible to treat ourselves better -- with more love, respect, and attention -- when we are in the middle of a battlezone all the time and/or at the mercy of someone's else moods.
No one will make you speak at your first meeting if you are not ready. Everyone there will understand where you are coming from without expecting anything of you.