How can I reduce sensitivity of corona area of penis, circumcised

I've been circumcised for almost 2 years and I've yet to have a good sexual experience with a female due to the sensitivity of the corona area of my penis. I wouldn't describe the sensitivity as painful (maybe borderline) but uncomfortable, and as soon as I or a female touches the area too much I lose my erection and struggle to regain it. I can't really say I have worked on desensitising the area other than occasionally letting the shower water run over it or gently rubbing it. Would just like some advice on the best/quickest way to get over this issue if possible. Thanks.

What do you wear for underwear? Curious that the clothing has not desensitized it enough already?