Im a 18 yr old male and have been going out with my gf (19) for nearly 6 months, we are both still virgins.
A couple of months ago we tried to have sex, but because of a combination of her being quite tight (even tho i finger her often with 2 fingers) & me having a fairly large penis, i couldnt 'fit' it in at all, the head wouldnt even start to go in (it stayed hard no problem).
So since this we have tried sex numerous times, but i keep on going soft just before or when i try to put it in her, its really distressing me, my girlfriend is understanding, but i guess she must be a little annoyed because we both really want sex.
I always make sure shes ready for it, through foreplay and / or lube, but then when the time comes, i suddenly go soft.
I can masturbate or recieve handjobs easily staying hard until cumming, so i dont think i have a proper erection problem, maybe just nerves.
But what can i do to solve this? I have thought Viagra, but is this something to see my GP about, would he proscribe me it?
It kinda dents my ego thinking i need viarga at 18, and this is all getting to me, i cant help thinking im a failure
Any help would be greatly appreciated.