I actually think it's good to find a place where you can identify with what folks are saying...it gives you a sense of belonging/a community.

Please don't take what your therapist says as "The Truth", she is a human being who makes mistakes. It's her OPINION, that this place has too much influence (interestingly, it's a place where a lot of folks warn you about her behavior).

I don't know your therapist's intentions, but I'm always weary of when therapists want their patients to ONLY be influenced by THEM. That is, when T's encourage isolation. (I don't know if your therapist is doing this or not, just a general statement). T's are supposed to encourage their patients to develop relationships outside of the therapeutic relationship and NOT be dependent on them.

If you think you have BPD, I think you would benefit from DBT treatment (it's the research gold standard for BPD/emotional dysregulation issues). In a true DBT program, you get individual therapy, group skills-training therapy, AND you can get in touch with a therapist by pager 24/7. These are the "true" DBT programs (somewhat rare since it is difficult to find therapists to be on call 24/7) and they are not covered by all insurances.

You could certainly look into the BPD diagnosis and if it sounds like you, try to find someone who practices DBT. I think everyone could benefit from emotional regulation skills/developing better impulse control.

Again, your therapist is ONE person who has a lot of issues of her own. Be wary of her discouraging you to get second opinions/be exposed to opinions different than hers. A good therapists wants their patients to get all the information they can, and then make their OWN decisions.