Your admitted sense of self-loathing doesn't make you a particularly good candidate on how to behave properly.

If a woman doesn't value you, it's because of how you feel about them and not because you're not bulked up enough.

Well, I appreciate your honesty. You should perhaps consider that you're projecting your own self-loathing onto other people. One's physical fitness has nothing to do with the quality of one's character, and the world would not magically become a better place if all us fat dudes got visited by the Muscle Fairy.