Not able to enjoy sex. N somones life.

I was started mastribution since 14 n with some wrong method like rubbing just by touching cloth .. due to this i dont able to sustain more then 1 1.3 min. My engagement will be fixed after 1 month. Bt i dont think i should go for it.bcuz for my life i will ruin someone else life.. they hve lots of wishes n hope. Bt im not able to give that happiness to her.. i never did sex bt used flashlight bt same issue happened (1 min of slow penetration n ejaculation) should i tell her im not able to fullfill your sexlife or this can be cure. Bcuz western medical proven that just SSRI ANTIDEPRESSANTS n SPARY are the solution . I did all start stop ediging bt nothing works much .. n im pursuing UPSC with Job so this stress take over me...i cant manage all this problem depression n somones life.