(((mckell))) I can feel your turmoil! Yes, many, many patients do this. No, there's no reason to be beating yourself up over it.
I think you really do want to discuss things in therapy and for some common reason you aren't able to -- yet. I'm glad you sent that note, and that you realized that what you felt was important. It's good for discussion in session, if you can brace yourself to do so.
You could print off what you just typed here, and also give it to the T, if you can't read it to T. Any information you can give your T to go on, to realize what confliction you have, will help your T help you, imo.
It takes time to build a trusting relationship with a T. Even once you feel you have one, there can still be topics that are hesistant for you, and you might find yourself "testing" the trustworthiness of the T once again.
Stick with the process. They don't call therapy work for nothing.
And, yes, you can tell the T you aren't able to discuss it in person.