If we're feeling bad about ourselves, it can be very difficult to accept compliments. Like maybe someone would tell me I'm a good friend, and I think, "No, I'm not," thinking of, say, a time I forgot to check in with them about something or how I probably talk about my own stuff too much (doesn't help that an ex-friend told me that). Or my employer might tell me I'm doing good at my job, and I think of the couple things that I missed/got wrong rather than the things I consistently get right.

Or with therapy, Dr. T has said positive things about me as a client, how I'm very engaged in the work, am always on time for session, am respectful of his boundaries, etc. But then, say, yesterday, when I walked right back to his office after I left to seek reassurance, I had the thought of "I must be his most annoying client ever."

I think this would actually be a good thing to mention to your T, particularly as it could be a symptom of depression.