I’m not circumcised but had a problem when I was younger with premature ejaculation. I read that a really easy way to get over this was to pull foreskin back and wear your jeans without boxers/underwear, this leaves the head of your penis rubbing against your rougher than underwear denim whilst walking & moving about and helping to desensitise the head of your penis. I tried it and low and behold after about a week it was great - it felt a bit uncomfortable the rubbing sensation initially but I soon got used to it till it faded anyway. Then I noticed this desensitization (dunno how you spell that!) gave me excellent staying power wiv the ladies - still sensitive enough to really enjoy sex, plus wiv the extremely improved confidence of being able to last as long as I wanted as oppose to previously where my over sensitive cock would decide when I came (usually within a couple of mins!) - result.
Sorry I know this is probably of no use to you MAR123 but it might help them guys feeling suicidal cos they can’t last very long in bed and feel suicidal and avoid it altogether - like I was until I gave that a shot and havent looked back since!