Hello Cheese,
I, too, kept the real extent of my drinking a secret for almost 10 years. The minute I became honest with myself and others, the path to sobriety has been easier for me. Involving others in your sobriety really does help, it's like insurance.
The drinking really can sneak up on you. But don't blame yourself, it happens. I've had a good upbringing, sober parents, every advantage... but it still happened. What we need to focus on now is sobriety.
I applaud your wisdom in realizing your problem and your bravery in confronting it.