Worth of a Submissive.

I've seen a lot of posts recently (not just on here, but one on here flagged this into my brain) about being worthless as a submissive.

Now don't get me wrong, I recognise that women, and in particular the fabulous women on this site are superior to myself, but does that mean that as a submissive I'm worthless?  My opinion is that if I am worthless, then what good am I to a Domme, and what does my submission really offer?  I know I'm not worthy of being a sexual partner to any woman, which is why I am perpetually locked in my tiny chastity device, and I don't see myself as an equal, but does that mean I have no worth?

I regularly see all subs referred to as losers, I don't feel like a loser, I recognise my place and try hard to be the best submissive I can be, better myself and better the life of any Domme I serve.  If I enter into a longer term arrangement I feel lucky to be in that Domme's life, in however small way.  This isn't to say that I don't appreciate humiliation, I do, but in a targetted way, when it is recognised that I have chosen to submit to that person and they are using that power over me.  I'm interested to know how others feel as for me this is one of the most off putting aspects of FinDom and wider FemDom.