Hello, im 18 and i've only had sex twice in my life, once with an ex and now a friend and I are recently starting to fall for each other. ( the second time with her)

And Most newcomers from what im reading have an orgasm too early yet I didn't orgasm once, I didn't want to tell her as i sorta feel partially responsible. We were awake having sex, for about four hours, doing everything. I did my job more than once ( or so i hope), yet even when having sex I don't feel im fully erect, either. Its to the point where Im able to have sex, yet not to the point where i feel like its 'fully operational'.

Also, i was also intoxicated both times, which I feel may be playing a big part on things.

Is this common at all or should i just try it out when sober and see if the alcohol has anything to do with it.