I'm sorry that your experience has been like that. I think society does place more value on a person based on their physical attributes and youth. I agree that lot of men do seem to be attracted to beautiful young women, but not every man does. I would not want to be in my teens or twenties again, with the doubts and uncertainties, and feelings of undesirability.
Speaking as a man, I can almost promise you that there are males your age that also feel unwanted and pushed aside because of their appearance, or other superficial traits. I know I did. I also know that I craved the attention of a woman, whether beautiful or plain in appearance. When I did date, (or later, was married), I was appreciative, and didn't cheat.
There really are men that put more importance on inner beauty, they may not be common, or easy to find, but it only takes one. I hope you don't become bitter, or give up.
As far as personality, you seem to fit in, and do well here. I know we're not the same as real life, but you have friends here.
I wish you well
peace