Being afraid is normal for such a big step. However the sober life is infinitely more rewarding. Continuing drinking you will only get progressively and exponentially worse. I have never done an in patient treatment or detox (but I needed to), however I am currently halfway through a 22 week Intensive Outpatient Program (IOP) that has weekly Group and Individual thearapy, Medical supervision, and Naltrexone to mitigate cravings. Go in with an open mind and participate as much as possible (even if you don't feel like it) in order to get the most out of it.