Hey Shear,
I know what you're going through, trust me. I am coming back from yet another hiatus from the sport, after countless trips to different praised streams throughout the south-central PA region left me with nothing but disappointment.. so much to the point where taking a 35 minute trip out to spend on the water wasn't even worth it anymore to me. I have 0 caught trout on a fly rod as well, and it's been 2 years since I bought my fly rod. I know I don't have expert advice, but if I could offer some words of encouragement:
1. Read and research until your brain explodes. There is SO MUCH information out there and the more you surround yourself with, the more you will be able to link pieces of the puzzle together when you are out on the water. For example, if the water is murkier than usual, what fly should I use? What insects are found on the bottom of rocks in this particular stream? What is hatching at this time of the year?
P.S. I am still in this phase!!
2. Tying flies helps me stay committed when I am out of the water, and I think it is a huge part of fishing - after all, one of the big pieces of being successful is identifying and replicating what you observe on the water. My first 10 flies were atrocious, I think I used a size 4 streamer hook to put together a tiny little elk hair caddis by accident because I didn't know any better. There are tons of great fly tying channels on youtube like Dave McPhail and IntheRiffle (they can get very very complex), but get very familiar with the terrestrials in the streams you choose to fish in. Fish do not care if their fly meal is home-made or store bought!
3. I personally believe that your fly should be on/in the water more than it is in the air. I had a big problem of just whipping my flies off of my line trying to make these huge, elaborate 50 foot dream casts only for no result. I have read on multiple threads that alot (if not most) success comes from within 15-20 feet of you, so a technique such as roll casting would allow you to cover a ton of water in a very short amount of time.
I'm going to be trying to get back out there this spring, hoping for my first trout on a fly rod since all I catch are chubbs. Feel free to PM me anytime so that we can share our woes (and hopefully some successes). Good luck out there!