scared to have sex for the first time

Hello!

I have been seeing this guy for a little while and the other day we were making out in his car and we moved to the back because he wanted to be able to “kiss me properly”. It ended up with me on his lap straddling him (I think that’s what it’s called?) while we were making out. He was very touchy and his hands explored a lot - he undid my bra and the drawstrings of my pants and all. He said “I want to do it with you” and I replied saying I was scared because - of course it would have been my first time - and he knows this because he was my first kiss and everything.

He said it was okay and we didn’t have to - I was horny and if it wasn’t my first time - I probably would have gone through with it.

How do I reduce this scared - ness ??

I’m scared of embarrassing myself - I guess.

Like doing something silly or stupid - like farting?

Or not smelling good down there 😖

Help a girl out!