Do you remember being jealous of someone in high school?

I have a real problem making other female friends in school.
I’m usually told it’s because they’re “jealous”.
But I don’t see anything about myself to be jealous of.
These girls have nice cars, they always have new clothes and makeup, they get their nails and hair done routinely, they’re popular and they always have boyfriends.

Meanwhile, I’ve never done anything risque, I’m sort of plain looking…I’ve been called “classically beautiful” and compared to 20’s actresses, but that’s not in vogue now.
I’m tall and lanky and dull and a nerd.

A friend of mine said they’re probably jealous because I’m “smart”. For instance, today I was watching a few girls in one of my clubs assemble a chair and they were having a hard time getting the screws into the bottom, so I said, “Why don’t you flip the chair upside down?” And they sort of ignored me and then one of them was like, “That’s probably a good idea.”

They never really do anything mean to me…they’re just rude and they ignore me and when they do speak to me on occasion, they’re very patronizing.

So when you were in high school…how did you treat someone you were jealous of?
And does this even sound like jealousy or do they just not like me?

I’m always really nice to them and I’m not terribly awkward so I guess I don’t come off as “weird”.