Can't play the way I can play during a lesson.

So, I'm a guitarist/bassist and I'm learning the violin for ~1.5 years now. I'm currently at accolay concerto in A minor. The problem is for the entire time I've been learning the violin, during the week I'll be able to play very decently and sometimes really really well considering the time I'm playing, but when the time to show what I've done throughout the week to my teacher comes... I 5 out of 7 times will not be able to do so. My shifts fail, my intonation fails and the more this happens the worse it gets through the lesson due to disappointment and agitation...

Lately I even record my practice session the day before and send it to my teacher to show them "Hey I can do this... just not during a lesson" :/

Anyone else had this issue and if yes how did you manage to overcome it if you did?
I seriously need some advice on this on what to do because it's getting really really frustrating and discouraging.

What's the point of being able to paly something if I can't play it to someone else also?