Reading this, I feel like she doesn't respond to your feelings. Calling what you talk about ' teenage stuff you'll get through' feels devaluing to me. Why would you feel like talking if that's the result? Of course you bring 'teenage stuff' to your therapy--you're a teenager.

Hello, T?! lol
It can take time to feel comforatable talking in there. It can take a lot of time. (9 months for me!). It takes time to build the trust needed to reveal even a bit of yourself.
The silences can be hard at first. They are there to give you room to think about what you want to say. After a while, they can feel very nice, like when you're with a friend and neither of you are talking yet it feels comfortable.