Mental Block During Sex?

Yaa

So yesterday I was getting ready to have sex with this guy I like and mind you this isn’t the first time we’ve had sex. I was anticipating it all day. I was waiting for it, planned it, and I really wanted it. The foreplay was good but when we started doing it it’s like my vagina instantly got dry and it’s not like I was turned off. I really wanted it but I’m not sure what went wrong, like it kinda reminds me of when a guy can’t get it up because of things like nerves, etc. I just don’t know why it happened cause I wanted the sex. I just think maybe I was too eager? Lol please someone reply