I would seek counseling rather than an "accountability partner" because everyone has their own issues they're dealing with. Addiction is a symptom of something that needs to be discerned. The Word of God tells us that there is safety in a multitude of counselors. It's wonderful to have a good friend with whom you can share and encourage one another. But wise counseling is needed where there is a stronghold of addiction.
Also my young brother Christianguitarist, remember not to beat yourself up with guilt and shame. But run to God's throne boldly and with confidence and speak openly about your feelings and your troubles as a son would with his awesome loving Father. Hold nothing back as God is blessed when His sons and daughters trust Him with their heart.
May you find rest and joy in the grace of Jesus Christ as He leads you in victory today and always. Peace, brother!