Most Helpful Guy
Well, it's just one boy's opinion, now isn't it?
When I was thirteen, I would have had a very different opinion about you than this boy did. You must understand, and this is something virtually everyone has to wrestle with, that you won't be attractive to everyone. Surely you have found some people physically unattractive, haven't you? This doesn't mean that they're objectively ugly to everyone, or even most. It could be that you have certain tastes in appearance that aren't shared by everyone. Likely, the same is true for this boy who called you "plain ugly" (though his discretion at word choice is... questionable).
By the way, I'm all for trying to improve one's appearance. However, I don't think that's necessary in your case, but that's just me. If for some reason you think you can, it's probably better to ask that question to one of your girlfriends. My wife told me my fashion sense is... questionable.
Most Helpful Girl
Aren't you to young to be thinking about boys and dating and stuff your only 13. Have fun being a kid for a while. Boys at that age don't know how to find beauty in a girl or know what they want in a girl they are immature at that age. Don't try to live your life impressing boys it doesn't do you any good. The right person will come for you when the time is right. Stay focused on your studies and your schoolwork of course you can worry about boys in the future. And don't rush into trying to fall in love and to trying to find a boyfriend because you'll just end up hurting yourself like I did when I was younger. Wait till you are in high school to find love to try to rushing into falling in love it doesn't do you any good. Having a boyfriend isn't everything.