In the past being smart was the only thing I had going for me.
At what point was being smart your only good trait?
It was back when I was in school.
It's great that you were so smart and you surely still are now. I'm sure you're still quite smart and that it helps you in aspects of your life currently.
I was the smartest kid, I was in top 1% in the class. I was held up as a model student to all the other kids.
You should feel proud of your academic successes. Your strengths are great and you should acknowledge them.