Depends on how you define 'good', really, doesn't it?
I don't believe there are 'good' people and 'bad' people – it implies a permanence to someone's state that just doesn't measure up to my experience of humanity.
No newborn baby comes with a BAD or a GOOD stamp on it.
So at what point does a person become a 'bad' person?
Toddlerhood, when they're a freaking nightmare? Teenagerdom, when they test boundaries and drive everyone up the wall? In their twenties, when they're making mistakes and learning to be an adult?
Once they've done a certain number of bad things (or at least, things our particular society deems to be bad)? What is that number? And if you do some good things, can you come back from being 'a bad person' or is it forever?
It's all made up – unless you ascribe to a binary view of morality and believe in a religious heaven and hell and good and evil, it's all just stuff a bunch of people who are dead now made up.
And also, does it really make any difference?
If you've left a trail of heartbreak and destruction behind you, will you really be lying in bed alone at night feeling fine because you found a philosophical way to believe that you're not 'a bad person' deep down? I'd hope not...