I'm sorry you are struggling with this too. It seems several of us struggle with internalizing positive reinforcement and praise and such. I have a tendency to say, "Thank you for saying that." It is as if I am saying that they are just saying a pleasantry and the old thing of "if you really knew me". But when I look at my behaviors in life I'm kind most the time. I was taught to "inventory" myself when I went to 12 step open mtgs with an ex for like six years. I have to admit that the habit I picked up of looking at myself honestly allows me to see that I'm not a bad person. Those were lies I was told, or sometimes the best I can do is maybe I was bad then but I'm not now.
Again, I really hope you feel relief and can maybe take a nice thing someone tells you about yourself and wonder, Could it be true? I bet it was.
Best wishes for you, Hidden1111