You have the innate capacity to tap into your mind's potential. You are not limited to any class, and instead can develop any class features available to the various Psionic classes across Pathfinder and D&D, a few examples being Psion, Soulknife, Aegis, Cryptic, Dread, Marksman, and Tactician. You start out with access to the first level power equivalent of whatever path you decide to start with.
You are able to develop different aspects of multiple classes at once, your psionic power and its versatility through meditation, self-study to learn the intricacies of your mind, self-reflection, and attaining new avenues of thought through experience.