Women have a bellcurve of capabilities, inclinations and skills.
So do men.
So do people born inside Route 128.
So do left-handed people.
Ideally any given person with skill set X should be allowed and encouraged by society to participate in career field Y.
...but the average height of people born in New York is not the same as the average height as is found in Tokyo. The average amount of fast twitch muscle fiber in Kenya is different than that in Chicago. The average enjoyment of sales calls is different among introverts than extroverts. The average enthusiasm for long hours is different for men and for women.
If a woman has the skills and desire to be a VC, great.
...but why should I be depressed if this is not the case?
There's an implicit unspoken axiom behind all of these sorts of arguments, that all demographics are identical in the distribution of traits.
That's false.