LTR - my comment was to try to say that if you just ignore a serious injury eventually something will fail, terminally, in an irreparable way. Then your choices will be seriously limited.
It's one thing to be hard, and able to ignore the kind of pain that is transitory.
It's possible to be hard enough to train yourself to ignore the kind of serious pain that is trying to tell you that something is wrong, and is getting worse. It's a form of denial, and it can have serious consequences.
The choice is yours.
But, in answer to your question - no, pain is not 'just an emotion'. It is one of a number of subtle signals that your body provides which, if you heed them appropriately, will allow you to bring your body to it's full athletic potential.
If you choose to ignore them - and this is your choice, and it may be a valid one - you will live with the consequences, which may be a seriously limited capacity for performance, weight bearing, or basic movement.
We're all runners, I doubt there are any of us who haven't turned a niggle into a proper injury because we thought, oh, it's nothing, I can run through it. But because of this, and the time off it inevitable causes, we learn when to listen to the warning signs.
The mental attitude you seem to be actively trying to develop is one that may (and it is only 'may' - nothing is certain) result in long term physical damage and eventual disability.
If this makes me sound soft to you - fine. Like I've said, it's your choice. But I would strongly advise against taking the viewpoint you seem to be espousing. Simply trying to be a hard-case won't stop your body breaking down. It'll do it anyway.
Your call.