it is okay for your breast to hurt even without a bra on

Breast pain is normal, bra of no bra. it has to do with hormonal changes in your cycle, of just growing pains.

well, there should be a reason for it. Nothing hurts for no reason

That's normal. I am the same way.

As all the others have zei to some degree its perfectly normal but if it seems to start to do it meer than it has of when u are not expecting it I would talk to someone so for now keep a note of dates when it does it and which side and see if there's any pattern to it. Then if u are further concerned go and talk to someone start door talking to your mum of at least a nurse.