I'm so sorry you feel this way. Sometimes it's hard to find your true place in the world, when your own family has treated you that way. But women can do much more than look pretty and cook and take care of the children and family. We can go to work, we can learn something new and do all kinds of things to feel we're much more than a face and a body for men's pleasure.
You have to start from the inside. I know it's not easy, and everybody tells you the same, but you have to love yourself, to protect yourself, to take care of yourself, like you'd love your child, trying to protect her and just wanting the best for her. You'd know she's not ok and she would not like herself, because she's sad and you'd know you have to start by making her forget her sadness and making her smile. Try to do all the things that you really enjoy, like painting, singing, dancing, even if you can do it only in the bathroom. All those little things that make you smile.
I've always thought that our families make a big mistake by treating us women differently. At the core, we are all human beings and not really different from each other, but from what society tells us. Try and feel like the person you are: full of love, full of sadness sometimes, full of expectations and dreams you want to make true. Try not to think of yourself as a woman, but as a human being. Then, think about what makes a woman be a woman, like compassion, strength, incondictional love, and then be the kind of woman you want to be. If you're tired of being an object, don't treat yourself that way! I highly recommend you try not to think of attracting men in a while, but instead try to attract yourself back to who you are. Look good for yourself, because it makes you feel happy, but don't pay attention to men who could possibly looking at you.
And always remember, that you have to praise, to respect and to love yourself, before anyone else can. If you want a real romance, start it with yourself. They say that, if you want to be the kind of person everyone wants to be with, you have to learn to live in peace by yourself first.
Good luck and don't give up hope! You'll see that , as soon as you can see yourself as the beauty person you really are, without looking at a mirror, you'll be the prettiest woman around