I agree with your therapist, you don't soun lazy to me at all. Then again, I don't know you. Your therapist does though. I'm glad you seem to be starting to take her point of view into account.

I just want to add, I don't think average is either good or bad. Most people are average. Average is normal, not above or below average. I also think average is where you can best get to know your self esteem level. Are you treating average as if it were above average, as if that means you're great at what you do? Or are you treating average as if it were below average, as if it's a bad thing? Average isn't lazy, it's just the right amount of work, in my opinion.

Besides, just because your teachers labeled you as average in your peer group back then, doesn't mean you are average now, nor does it mean they were right then. It just means they thought so. Needless to say, you can be average at one thing and excel at another.