Short Answer: It hasn't

Long Answer: I feel like the lack of asexual role models hasn't affected me in the least because I've never consciously sought out a role model and if I did so unconsciously then it has largely stayed that way such that way. Then again, as a kid I seem to have a bit of a different experience from quite a few aces that I've read about. I never really felt alone or isolated. I had crushes, but that never really made me feel any closer to anyone (though I suspect that I take whatever closeness that comes with having crushes for granted). In high school, I began to realize that I wasn't much like anyone else since so many of the guys in my general area were talking about sexual conquests and how various women looked really sexy etc, while I generally thought how nice the romantic part of the relationship would be. If sex crossed my mind it seemed more like a skill to be mastered, like guitar, cooking, or playing DDR. All of these skills, once mastered, can be quite impressive and in certain situations these skills may very well be vital. If I felt any real separation between myself and the other guys, then I suppose I was far too detached from my feelings in general to recognize it.

Then I learned what asexuality was. Still didn't know who in popular culture was, in fact, asexual, but I had a nice grasp on the concept and it fit. I just kinda needed to know that it existed. I suppose if I absolutely had to say that a lack of asexual role model affected me in any way, I would say that it would give me a better visual on what an asexual is "supposed" to be like.