Your brain doesn't help you and it doesn't work against you, unless you "tell" it to. Tell the brain you are thinking more rationally, use self-talk with it, and your brain will help you as long as what you're doing is rational. The brain will help you, and be on your side, if it knows what you are doing.

https://socialanxietyinstitute.org/blog/cognitive-behavioral-therapy-social-anxiety-makes-physical-changes-brain