TL;DR, Fuck her or lose her.

Just as a head's up, she's basically telling you that she's going to cheat if you don't sleep with her.

Everyone get's horny, regardless of how good a person you are.

Just get her off, or you may wind up losing her.

And don't be self conscious if you suck. Everyone is terrible their first time, regardless of what they say. Fap twice that day before hand and you won't have to worry about pre-mature ejaculation.

And saying it's because of morals just makes you sound like a self righteous twat.

It's counter intuitive, but it's true.

This isn't some long standing relationship, it's a highschool one.

She won't stay if she feels neglected.

If you don't want to have sex or you don't think you're ready, you shouldn't. Like you just said, it's a high school relationship, so if she leaves because she really wants sex, why the fuck should it matter?

Sorry. That was not my intention. My mistake.

You should probably get on that - her... whatever.

This isn't some DO IT FAGGOT shit either, it's just...

Just save yourself the frustration and bang her.