This question is best answered by using examples of compliments your friends have given you. You can keep it brief.
"My circle of friends is very close and we spend a lot of time together. I believe they would say that I am thoughtful, generous and kind. I am sure to surround myself with people who will challenge me and bring out the best in me."
"I made a lot of close friends when I went to school for education, and they'd describe me as a very kind person with a very positive outlook. I think most of us are, the ones who are drawn to teaching."