What, to you, is a responsible person.?

somebody who takes care of what they own and protects what they borrow.
somebody who doesn't slack off on their duties and responsibilities (of course)
somebody who is trustworthy and has good integrity.

Someone who doesn't drink and drive/get high and drive.

Someone who takes care of their family.

Someone who... isn't me, but I'm just being pessimistic.

I think I have enough common sense... but I don't always choose to use it, therefore, I can be quite the irresponsible person.

A person who gives back what they borrow , care for family , doesn't steal , snatch o take. Responsible and takes care for what they have done , not leaving the mess behind for someone else to deal with it.