Have you considered writing them down and then going to the therapist with the piece of paper?
I did it once and it helped.
To add to this, I definitely would recommend that OP also look into something called alexithymia, where you're essentially colorblind to your own emotions. This may be why you think you're not built for it and have trouble talking about your thoughts. It could help to tell your therapist "Hey I think I might be alexithymic, so I may have trouble articulating my thoughts and emotions, so I may need you to help me work through it by prompting me at times or allowing me to have some time to think."
Here's an article if you want more information, and I encourage you to do your own research as well or talk to someone about it.
https://www.medicalnewstoday.com/articles/326451
Alternatively, instead of therapy, you could also try coaching. The main difference between coaching and therapy is that coaching is more future-oriented and built for people who feel stuck in life, or for people who know what to do but don't feel motivated to. I've never done coaching myself so YMMV but I hope what I've said is of some help for you.