If you haven't seen this counselor yet, I would just call the center and cancel the appointment and tell them you're "not interested" anymore. If you haven't seen this counselor s/he has nothing invested in seeing you and the clinic doesn't "care" either, being administrative. But I don't know when/how you got into therapy with this clinic. No one wants to see someone who doesn't want to be there. Just cancel the appointment and explain you've made "other" arrangements (if you feel you must explain; it's not really any one else's (including your mother's) business.