Hide your virginity behind a phrase like
>I didn't have sex for a long time
if you think something went wrong during sex, but not while you are doing it, could kill the mood. if there is a problem while sexings, take it with humor instead of self hate
the phrase btw 'worked' for me, maybe gf questioned it in her mind, but when you watch a lot of amateur porn, fucking is not something mystical anymore. I mean you can handle it without asking yourself what to do next, it comes automatically more or less and you enjoy how your dick feels in a vag
I would agree with the brit in a lot of points and definitely with the one about her getting fucked in the next room.
If you can't handle that, don't do it. And since you are a virgin I would guess it would be a hard time even if you can handle it. At least I would be jealous she gets fucked, you can hear her moan and the bed moving or whatever while you sit there in front of your computer. Feels quite shit when you don't have sex yourself. I guess it will feel depressing when you love that woman.
Always try to look left and right until something is a safe bet. That is normal.