At this point, the best way to voice this dissatisfaction is to yourself. The idea of walking into your manager's office simply to express dissatisfaction with your pay is not a great idea.
If there are specific aspects of your pay that are either inequitable, discriminatory, or somehow in error, then it makes sense to approach your manager. However, in any of these cases, the idea is not to go in and complain, but to describe the specifics of the pay-related problems and then present some suggestions to correct them.
If your dissatisfaction is basically a matter of wanting to be paid more, then you should be on the lookout for ways that you can increase your value to the company, such as by increasing your skill levels. In addition, rather than complaining to your manager about your pay, you can ask him or her for some suggestions regarding the kinds of steps that you should be taking right now to put yourself in line for greater pay increases.
Being dissatisfied with one's pay is not enough to merit an increase. If it were, the lines to most managers' offices would be quite long.
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