I am scared of being honest to my therapist in case she judges me?

Over the past month, I have been having pretty bad anxiety. I just started to get therapy but I have not mentioned to my therapist that I took weed for the first time a few months ago and that resulted in my first-ever panic attack.

I feel ashamed of taking weed and guilty. I do want to tell my therapist but am scared of being judged. Whenever I go past the smell of weed sometimes I get a sense of anxiety. Even though I am not consuming it my brain freaks out slightly.
I am scared of being honest to my therapist in case she judges me?
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