There's a lot of negativity in this thread that I don't think is entirely warrented. It sounds like you're both still very young and you haven't been dating for more than a few months. It's alright to just have a fun, shallow relationship for a while and then move on, especially at your age. That doesn't make you a terrible person.

If you want your relationship to last beyond the first few months, though, when you're both still in love, you'll have to develop some sort of emotional connection beyond just fancying eachother.

The way I see it you have two options. The first is you enjoy the relationship for as long as you do. You get your emotional support somewhere else. When the initial attraction wears of you break up.

But if you want a serious long-term relationship, you'll have to address this issue. You could try telling her how you feel the next time she changes the subject. Tell her you need to work through these negative emotions, and it'd be nice if she tried to listen and/or comfort you.

Or perhaps next time she's feeling insecure and needs to be told she's not stupid and ugly, you change the subject and show her some funny videos. See how she likes it! This is arguably a bit passive aggressive and immature, but it does sound like empathy isn't her strongest point. It might help her understand if she experiences things from your point of view. Depending on how she responds, you could then address the matter in a more direct fashion.