You may not have dependency issues yet, but if not you're on the fast track to having a real problem with benzo's. Luckily Diazepam is a real good benzo to taper with, so I would start doing that ASAP. Benzodiazepine withdrawals can be very dangerous and result in seizures and death. Really, I hope that you can find the power within yourself to get of the benzo-train before you have to face those hellish withdrawals. I'm currently tapering off of clonazepam, going down .5mg every 2-3 weeks, and even with that I'm having trouble.
Also, like others have said, benzo's are not like alcohol where you can tell that you're fucked up. On benzodiazepines you'll be slurring your speech but you won't even be aware of it. Longterm benzo use can cause serious memory problems, which is another thing I have real problems from. I remember there was a point in time when I was taking an ungodly amount of alprazolam, and ironically my memory was worse off the xanax then on it, that's how damaging the withdrawals can be. When you're using heavy dosages of benzo's, your life becomes one huge blur. You might feel better/less anxious, maybe you even get a little euphoria out of it (diazepam and xanax are the two benzodiazepines that I would consider mildly euphoric, especially diazepam), but you're going to run into problems. Blacking out is no joke, I've woken up face down on a crowded NYC train before 15 stops past where my house was, not knowing how I got there, and that's one of my less 'traumatic' stories in regards to blackouts/amnesia.