How can I thicken the skin of my ?

I am 18, and used to have a very sensitive glans. for the last few years, i've followed the methods of others to try to thicken the skin, and reduce the sensitivity. Now, the pain is mostly gone, but some things are still very uncomfortable (such as showering with higher pressure streams of water) is there anything I can do to help my skin thicken? I am uncut, by the way.