Welcome to SR, you will find lots of support on here. It took me a while to finally get sobriety right, and this site was a big part of my plan.
You said you are able to get to three months sober, what happens about that time that you choose to go back to drinking? I do not attend AA, but lots of people on here do, and may be around with some good advice about the 12 steps, it I would suggest putting a plan in place, and specifically thinking about what you will need when you get to that point in sobriety where you have gone back to drinking in the past.
You can do this, and being sober is worth it.