One of my first sexual experiences was like that, weirdly I ended up in a 3some after fooling around with my mate and his 'mate', i was taking it from an older lad who came real quick but it certainly felt like he 'did his best' it didnt really feel anything special and to be honest a lot of the moaning and groaning was faked after the initial 'opening up' then I turned to his mate who got involved, that was an experience we were both around 18 and his mate was probably 40's.
It was hard for me because the younger dude was more athletic, had a bigger cock and was more active.... I felt guilty afterwards as the older dude clearly could see that it was genuine the 2nd time but with him, he wasnt up to the same standard.
I never had a 3som again to date after that