Will my therapist force me to talk about stuff?

Nope!

As your therapist, I'm not going to force you to talk about stuff you don't want to talk about. A therapist is supposed to be someone you trust. If I forced you to do stuff, it would probably be pretty hard to start trusting me, don't you think? I'm here to support you. You're allowed to share as much or as little as you feel comfortable sharing.