Maybe your silence isn't wasting any time at all. Maybe your silence is saying the things your mouth can't, yet. Silence tells your new T that you don't yet feel safe enough to share; it says that you feel uncomfortable; it says that this is a scary experience for you. Sitting with it in the next session, you can also listen to your T's silence. Maybe it's saying something, too--like she accepts you, like she'll wait until you're ready, like she is okay with you being silent for now.