The willpower thing wasn't enough for me either. For me, it felt a bit isolating and when that alcoholic voice popped up, I felt like I didn't have anywhere to turn that really understood.
We are similar ages - I'm 27 years old and I'm newly sober. The recovery plan link D shared is a good one. Honestly, up until recently I feel like I'd been white knuckling sobriety and clinging on. I attend AA meetings for the community, read a lot about addiction, post here and often attend community drug and alcohol addiction meetings too. I do a bit of a mixture of things and it works for me, and I know you can find the right path for you :-)