Hi Michael,

Jam sessions like the one you described is an entirely new way of playing if you're not using to playing with others.

You may have to train your ear to be able to tell which key your buddies are playing in and then jump in with chords stabs or small licks here and there.

It's also important to feel the rhythm of what your friends are playing too, because if you play out of time, it's very noticeable!

I suggest practicing with jam tracks by using the Jam Station here: https://www.guitartricks.com/jam.php

And brushing up on some scales.

Best,

Billy