I want to wait to discuss something big in therapy
Why do you want to put off the big discussion?
Because therapy is my time to decompress my issues.
Going to therapy is a good choice. You shouldn't delay important topics in therapy. Even thought it might not seem to be helpful, therapy can be more effective if you tackle the larger issues.
Seriously? I don't want to work on this right now.
Okay, I'll leave you to your therapy. Good luck.