Reluctant to Safe Word

As a developing masochist, (and being quite aware of the risk involved
in most of my play or scenes) I am very grateful for, and respectful
regarding, the use of safe words and gestures. The importance of
which is perhaps is intensified by the fact that I am not within a
relationship dynamic, and therefore must utilize the safe word
precaution that is provided to me upon engaging in play with a
partner.

I am a female, who feels and responds in ways which are sometimes on
the borderline of extraordinary and extreme. The lengths to which I
will offer my body, and my mind, for the pleasure of a man willing and
capable of inflicting some of the most cruelest forms of pain, remain
uncapped. I have opened myself to sensations and experiences that
have forever dissolved within me, the former ignorant understanding I
had of my own sexuality.

In this time of discovery and development, I have not once used a safe
word to end a scene.

There were times, where I felt on the edge of mouthing it; where even
my own tolerance for pain began to falter, and yet I continued to push
myself on. The desire to bring my body past the invisible precipice
on which I teetered, so intolerably alluring; to feel the seductively
sweet surrender in the moments where sanity and control no longer hold
meaning, and the only truth in existence is the breath that follows
after the next.

I am a masochist, and I am reluctant to safe word.

Is there a sound, objective reason, for which I should be made to safe
word? Is there a need to experience the reality of having to use
one? Is simply recognizing and accepting that I do have limits,
enough? Is this a lesson to which I must learn?

Questions, for which I have yet to find answers.