My first above average guy was when I was 25. He was only the second guy I'd ever been with. And yes, while he was a sexist, alcoholic asshole, and terrible at foreplay, I experienced my first orgasm with him. I have no shame!

(He was more above average in girth rather than length. I didn't measure him but I think from feeling, that he was a little above average in length and considerably above average in girth.) Also, due to my being not aroused by foreplay, I was totally dry when he entered me. This may have contributed to my repeated infections during the time we were together, but I still have to admit that when we started going at it, I enjoyed it anyway!
The third guy I was with (I was 30 when we started dating), was also a big guy, but in this case more length than girth. And he's good at foreplay and I am aroused. He and I have been involved in an open relationship for the past 14 years, and he is NOT a sexist, alcoholic asshole! Yay! His problems are more health-related and that he is unable to work.
I've also been with two other above-average guys. The last 3 guys I've been with have all been above average. I haven't been with an average or smaller guy since the mid-90s.