I still think you should talk to them. Maybe they are concerned about you and will be relieved to understand.
I know for me, even if it is something I don't really want to hear, I want my children to share with me what is going on with them, especially when I can see there is something troubling them.
My oldest son has emailed things to me that he feels uncomfortable talking about....but I think we both feel better when we actually have a conversation. The emails kinda open the door to a conversation.