I personally have always, even as a little child, had the feeling that if someone gifted me something I wasn't happy or appreciative enough to deserve a person giving me anything. I still do.
So now whenever any holidays etc come up it just stresses me out because I think I will react wrong, that they'll think I dont like it and that I blame them for doing it wrong even though I am grateful.
It's gotten to a point where, because of this anxiety, I dont feel emotionally thankful or happy about gifts anymore, I feel guilty. But I still am thankful on a logical level.