Looks like you have 2 choices - keep drinking or follow their advice. Do you want to stop drinking? What sucks is how we abuse our bodies over the years, not the chance to get better in a safe environment.
It certainly seems scary, and your alcoholic mind thinks it sucks because you don't get to drink anymore. But detox is a safe place for you to do just that - and have others there to help you out. Getting sober is not easy no matter where you do it, but it is worth it many times over. A little pain now, a much better life later.