Nervous About Losing Virginity

So I've been talking to the girl for a bit on an app for casual dating and sex. And we agreed that once we're free we'll meet up. Here's the thing, I've never had sex, and I've never even kissed a girl yet, but I haven't told her that (I know I'm a scumbag for that) so the pressures on for me. Is there anything that I should know because I am very nervous about this. Any help is appreciated.