I find that most cockheads are sensitive, except for a number of circumsized one's which are as dead as a doornail. Lol. Of course, uncut cocks tend to have more sensitive heads.
Anyway...
If you feel your sensitivity is something of concern, here are a few suggestions;
1) First, try focussing some on your dickhead when you masturbate. No need to grab it hard or go too fast, just be gentle and soft with it for brief periods when you jack off. Keep this up regularly and as time goes by, see if you can increase the durations and intensity. Lube will help.
2) There is a sort of sex aid you can use to dampen the sensitivity of your dickhead during sex, but I'm not sure where it is sold as I've never bought it, just seen it around once or twice. It is a sort of gel, I believe, and it will make your dickhead less responsive to manipulation, while not effecting your hard on. I think durex make it, or at least used to but I could be wrong. Hopefully you can still find this online somewhere.
Just remember though, for some people there will be no real solution. You may just have a dickhead that is naturally on crack. If that is the case and you find no alternative methods of practice that help or work, it might be best to tell your sexual partners to be mindful and careful with you. It's nothing to be ashamed of after all. I mean if your sexual partner said you were too big and to be careful when you fuck them, would you think they were pathetic? No.
Well maybe I would but I'm not talking about me.
Anyway, hope that helped.