How old are you? I found direct contact with the head very uncomfortable when I was much younger, but shortly after I started masturbating regularly that sensation became less bothersome and more enjoyable. While its still one of the most sensitive parts of my body, I can touch the exposed head without any discomfort now.
I know a lot of guys sometimes try to leave the foreskin retracted for extended periods of time. If you can't touch the head then that might be too much for you, but I've done that in the past and just tried to see how long I could keep it retracted while I went about my day. Eventually it stopped being uncomfortable and instead it would cause me to get hard.
Another thing I tried while showering was to put the shower head on setting that had a lower pressure, thicker stream and would point that directly at the exposed head of my cock. When I first started doing that it was a very intense feeling, and for some reason it would cause me to need to urinate. Overtime the feeling got less overwhelming and became more enjoyable.
I think the loss of sensitivity is something that happens naturally, to some degree, as you get older. But just like anything else, the more you expose it to stimulus the less of an impact that stimulus will have.