Allow me to be blunt, you need to get over those fears and jump into sobriety head first. Just do it. It is hard the first week or 2 cuz you're an addict, but you don't want to be, right?
As one of our great literary scribes put it, "Faith is what you make it." - OutKast
It doesn't need to be hard, you make it harder on yourself thinking that way.
"It's not a lie if you believe it." - George Costanza.
The power is within you to overcome this. You may wanna try other programs available as well to you. Find the tools that work for you, find outlets other than drinking/drugs/fast food you enjoy. Keep a journal, set small realistic goals for yourself.
Best to you, there's tons of support here and it's what's kept me going in between therapies and programs.