If the only possible way to explain why the gospels tell us only men were chosen as apostles, then you might be right.  However, that's not the only possible explanation (and it's not even the best).

In Jesus' time, men and women did not receive the same education.  Young men went to the temple, where they were instructed in the Jewish faith.  Women were not accorded the same opportunity.  Rather than being taught their faith in the temple, they were educated in the home, where they learned the skills required to care for their families.

The gospels tell us that Jesus commissioned the apostles to go forth and teach all nations (in other words, to be missionaries).  It only stands to reason that Jesus would choose those with a good religious education for this task, and in Jesus' time those who had that education were all male.