so if you EVER did something bad it makes you bad? well, then there's not one "good person in the world, in that case. Every child has been bad, therefore every adult has been bad. Now, the more accurate statement would be that no one is PERFECT. Everyone has done something they regret- some people have more regrets than others. I think what makes a person "good" or "bad" is more in how they conduct themselves on a daily basis- how they treat others in their personal and professional lives, and how they handle situations that come their way.
I think the best way to define if you are good or bad is to look at a simple ratio of good things you do:bad things you do. Everyone has done something bad and everyone has done something good in their lives, which you are overall depends on what you do most of the time. As for myself I would say I'm not really a good person yet, but I have been trying a lot harder recently to become a better person.
I wouldn't say good as in a good person who has not done anything wrong. I try my best to follow the law and help my fellow man.