Hello there, and thank you for sharing your feelings with us.
No two women are the same, physically or otherwise, so strictly-speaking, to typify women based solely on similar shapes is to objectify them, and to identify them by those objectifications is to reduce who they are down to that part of their body by which they are being judged. That you feel like an inferior woman because you don't have the same shape as another woman is awful, and there is no way that it can feel good to be subject to that kind of objectification from your own mind.
As our bodies and our minds grow and near to sexual maturity, we begin to associate certain parts of the body as erogenous, or related to sex, because of the stimulation we feel when we identify that touching those parts of the body give us or someone else a sense of sexual stimulation. This is different in different people; some people consider hands to be an erogenous zone. Some people are stimulated by a breath or tongue on their ear, some are not. Some people are aroused by a shapely buttock, some find that area of the body loathsome because it is where we excrete waste. Some people find their neck an erogenous zone, others completely lose their sense of security when their neck is touched, and not sexually aroused by it at all.
I'm certain you see where I am coming from by now. There are hundreds of places on the body and hundreds of methods of stimulation that are related to this discussion, but we will stick to shape.
It is also cultural; "-gender- with a -specified body part- are -good/bad in bed-.". These such objectifications are deeply ingrained, are this is because mass-media took studies of what most people find attractive and marketed those parts of the body as though that is what ALL people find attractive(and by proxy marketed the most popular types of body of their eras as the most desirable, saying that if women want to feel attractive that they should look like the kind of woman who is most popularly considered attractive). There are also men who feel insecure in their sexuality because they don't find physical traits of women attractive they they are told by media and peers that they "should".
Don't judge yourself based on the biased objectifications other people would put off on you, and do not judge your worth based on your body. You are more than your breasts, or any other self place on your body. I assure you that there are people who find your body type attractive. For every body type there is a person who finds them physically appealing.
I hope I have provided a useful perspective for your question. Please keep in contact and never forget that you matter, and you are not alone.
