If I don't feel like it, I don't go. It's my choice.

If I cancel one appointment after another, then my therapist is likely to tell me what's going on. Then we talk about it, and there may be a pattern of me running away from an important issue.

But it would worry me if whenever I missed a single session my therapist would want to talk about it at length or guilting me or there being the assumption of me not having the right to take time off (or that if I do, it must necessarily be a deep psychological motive for me missing an appointment).