"If a person thinks that women cannot do technology well and fails to consider you for a job, they have power over you. Not absolute power, not power to stop you completely, but power of some magnitude. If a person doen't like the color or shade of your skin and discriminates against you, they have power over you. And you will find such discrimination in all societies, including the African-American."
Forgive me if I misinterpret anything you've said, but this particular quote struck me and I have to make sure I understand what you're saying and respond appropriately.
It sounds as though you are saying that a person has power over you if they don't like you, or don't believe in you, and make it known. Of course, the job example is somewhat valid, but really it only postpones, rather than prevents you, from doing something. There's always another job, even if you have to wait a while.
Other than that, there's really no reason that another person's negative attitude should hold you back. In fact, quite the contrary, it should motivate you to work harder and prove them wrong. Hell, sometimes that pays off even better than you expected. Say, for example, a man makes an outward claim that "women can't do A" and you, a woman, are offended. If you simply sulk and complain that the power of sexist people is holding you back then, well, all you're doing is fueling the sexist attitude. If instead you do A (whatever task Mr. Sexist Man claimed you'd never be able to do) you'll be proving him wrong and, perhaps, even changing an opinion.
There are, of course, sexist people that are just that way and will never change. It's frustrating, naturally, but it is what it is. Then there are sexist people who are that way simply because no one has ever proven them wrong. If you do prove someone wrong who knows? Maybe you'll earn a little respect for yourself and other women.