As an atheist, how do you determine that you’re a good person?

If you’d answer yes to the question of if you’re a good person, what measuring stick/standard are you using to accurately determine that?

I’m asking from a standpoint of being a Christian, I use Jesus Christ as my measuring stick whom I view as the perfect person, that being said I don’t feel that makes me a good person automatically if anything it guarantees that I won’t be a perfectly good person and by having that unachievable goal it makes me constantly strive to be a good person.

So I’m extremely curious as to what standards someone whom doesn’t believe in Christ or even a relative concept use as a standard to compare themselves to