It could be that you simply dont have the correct "wiring" to respond to lsd. Take my wife. She trips on anything pretty easy, unless its lysergic. Lsa, lsh, lsd, lsz al-lad, eth-lad, she's tried them all, lsd at a very high amount around 800ug even, and never had so much as a silly thought. I have a friend that can't get high off of cannabis or dmt or mushrooms, but half a hit of cid blows him apart. I need 2 hits of lsd, 150ug hits, to feel anything other than a loose silliness. Some people are just not capable of dealing with certain chemicals for whatever reason, and people have varying tolerances as well.
Of course, benzos are never ever the right thing to take if you want to actually enjoy your trip or get something out of it.