Can I talk to my high school counselor about this?

I'm worried about my mental health, particularly that I show many symptoms for general anxiety at high levels. My mom will not allow me to see a therapist about this, despite my concerns. She acts as if my behavior is entirely my fault and that I can control my anxiety-like actions.
My counselor has drop-in hours available, the only way I can contact her without my mom receiving notice. My mom has said before "your counselor is not your therapist, she's there to discuss academics". Should I not go to my counselor about this, as well as my mom's attempts to isolate me socially? Thanks.