Of course you can make it.
That self-doubt is being thrown at you by your addiction, trying to make you think you're not up to this. You totally are able to do this. Is it any more difficult than the first few days after you quit? Of course not. Besides, drinking doesn't change any of those issues. Just ensures you have to start all over again.
Look for the voice of your addiction in that conversation:
You: I can do this
It: You're never going to make it.
You: I'm strong.
It: You're weak. You're confused....
It cannot make you drink. It can't buy the booze, it can't even lift a glass off the counter. Its only weapon is to trick you into thinking you want to drink. It wants to drink. You obviously don't, or you wouldn't have made it this far.
You can do this. Don't let it trick you into doubting yourself for a second.