It's always struck me as odd that the same guys who swear by long foreplay and sensuality when with a partner, prior to intercourse, forget all about that when they are alone. If you're having a hard time enjoying masturbation, you might not know how to make love to yourself. The post about sex being "in your brain" is very true. Try relaxing, taking a long hot shower, or spend time in a hot bathtub or hottub. Then get out the baby oil or massage lotion. One of the best places to massage is your inner thighs. Ask any masseur; the moans start when you start working on inner thighs.
Additionally, experiment with different speeds, angles, different lubes.
I would add one thing to putting lube into a condom. You should then slip the highly lubed condom over your erection and gently (and you'll need to experiment with tightness) wrap everything in an ACE bandage. (If you're not in the US, and ACE bandage is an elastic athletic wrap, usually in 3- and 4-inch widths. Experiment here, making a kind of "fleshlight" out of the bandage and lubed condom. Let me know what happens. Dennis