I think Tinder has made me aware that I'm a bad person.
Why do you think Tinder made you aware that you're a bad person?
The matches they're sending me are all bad, selfish people.
It is understandable to be upset that you are not the person you thought you were. Change the way you act and think and hopefully you can find better people to date. It's never too late to change.
I'm not sure that I can change my behavior.
You can always change your behavior if you want to. Evaluate the behaviors that you think are bad and take steps to change them. Over time, you'll become a better person.