While putting on condom i ejculate... is it because i become so sensitive or some other reason? please help

Here's some tips: You're at the peak of your male sexual powers and your physician may be able to offer some tips. Try some anesthetic cream on your glans. Ask your physician about a low dose of a selective serotonin reuptake inhibitor. You may acquire better control if you and your special person plan time when intercourse will not occur but you practice the squeeze technique -- it's fun & may help you.