Group therapy would be my worst nightmare. I've done DBT skills group and that's about as close as I've come. It's not about being strong enough to deal - group therapy isn't for everyone and it sounds like there aren't appropriate rules to keep the place a safe space. I don't know how to encourage you exactly except to say that wanting to work with your therapist one on one is absolutely your right and your frustrations with group are valid and worth being heard.

If your T can't respect that or can't hear that then the problem isn't you, it's your T and the therapy group.