When you submit to sexual servitude, you are accepting that you are serving your Master's desires and not your own. That means that whatever idealised fantasies you had are secondary to your Master's actual intent.
It's no good making a pretense of submission while trying to get exactly what you want, regardless. You need to learn to enjoy not getting what you want.
Perhaps you imagined that you would be kept denied exactly enough to thrill you, to turn you on, but that you'd get whatever you can't do without - enough orgasms to stay satisfied, or enough edges on your Master's cock to give your pussy adequate pleasure.
A genuine chastity slave should accept that she won't be satisfied, that there will times when she is desperate for release for her pussy and she won't get it. That she'll be told "no."
Learn to enjoy your pussy's suffering. Learn not to expect relief from denial. Learn that although your pussy may want to come, all that matters is whether its Master wants it to come.
And the answer might be "no." The answer might be "no" every time.