One of the roots of the word "yoga" is "yuj," which means "the act of yoking," (according to the Monier-Williams Online Sanskrit Dictionary).
We practice a posture-based yoga --- the series of poses are how we practice the techniques of Ashtanga. These techniques --- breathing, breath-body movement, gazing points --- allow the experiences of yoga to arise.
However, I would encourage you to not "yoke" yourself too strongly to the idea of "perfectly" performing postures, and series of postures. This is to yoke yourself to the short game, or a very transient and limited-"I."
Instead, I would encourage you to commit yourself to the principles lie under your interest in yoga --- whatever they may be.
Maybe yoga makes you more patient. Or less angry. Or it makes you feel like a more complete person. Or maybe you feel more at home in your own skin.
Patanjali, in the Yoga Sutra, outlines a three-tiered strategy to help us devote ourselves to more than rigorous disciplined practice.
Of course he suggests we should practice (tapas). Yet he tempers this by suggesting we should also study (svadhyaya; literally "to place in ourselves"), and we should cultivate a sense of devotion or surrender to the "Lord" (ishvara pranidhana).
As many of you know, I am not a supernaturalist. I've come to my own useful understanding of ishvara pranidhana through poetry. Some examples of my favorites --- not esoteric by any means --- are Rilke, Neruda, and Rumi (the Sufi poets are pretty great). I also really appreciate the lucid clarity of the poems of Raymond Carver.
So have fun, and enjoy practicing the yoga postures --- and remain committed to what drew and continues to draw you to the mat.
Jason owns and directs Portland Ashtanga Yoga.