I always found it hard to understand what are the ultimate generic principles that drive people with the attitude that you demonstrate (which is even more surprising given that so many people around me also do that).

Why should the percentage of women in parliament be related in any way to their percentage in the population? Why don't we apply the same reasoning to all the other properties which can be used to divide people into groups (e.g. right- vs. left-handed people, gamers vs. book readers, engineers vs. lawyers, meat-eaters vs. vegans). When there's literally an infinity of possibilities, what makes women vs. men so special?

Why does your notion of representation require sharing traits with the elected person? If I took part in the elections (and I believe they were honest and not rigged in any way) then the person who wins represents me in the sense that this person is now legally authorized to make the decisions (limited by the laws) on my behalf.

As some others noted here, since women voted on elections before, how can one claim the elected people did not represent them?

You seem to be having a different idea of representation. What is it and why should it matter? This is an honest question, not trolling or anything.