Monotony and ugly, routine circles

Where to begin.. I am 22 years old. I have no college experience except for an incomplete semester at NIU 5 years ago and one semester at a nondescript community college about 3 years ago.. I am a [grossly underpaid, under-appreciated] retail manager for a resale store and I have all kinds of smoldering potential for just about anything...but I don't have the lust or drive for any of it anymore. I was a dancer growing up, most of my life. Ballet, jazz, lyrical, modern, hip-hop, you name it. Also an artist, dabbled in just about every medium- watercolor, oil and chalk pastels, charcoal, acrylics, oils, conte pencils, you name it..same story. My mind was teeming with ideas, creativity, and I was enamored with the possibilities of each new day and every person with which I came into contact. I had a zest for life unparalleled to most I knew... then I got intimidated by the big bad 4-year university and dropped out before first semester, unable to choose a career path and unable to resist the temptations of my latest enfatuation..which became one of my greatest loves and greatest downfalls..Kayla. So then, long story, short: Lots of drugs, lots of alcohol, lots of different places of living, lots of wasting of my youth and talent and brain cells and serotonin.. Then a couple years later here I am, in love again [but this time with someone who loves me back], having held a job for nearly 3 years now--which is a personal record--and making decent enough money for someone my age, with my educational background. As a manager, no less. An assistant store manager, to be exact. I pay my own bills, I live on my--well our--own in our own apartment that we pay for ourselves, and answer to no one.. So tell me why I feel more trapped, exhausted and dissatisfied than I have in my entire life? Sometimes I fantasize about walking out into traffic so that I have a legitimate excuse for not coming into work that my boss can't make snarky, gossipy remarks about to the staff when I'm not around... I would give a vital appendage to be back in school working towards some kind of degree that spares me the anxious rage that comes from being sized up by retail employees and customers....for fuck's sake, someone tell me there is more to life than customers spitting in your face when they argue with you about your perfectly reasonable-and considerably generous-return policy... I'm barley hanging on here...Some days I strongly consider blowing all my money on a car and packing all my shit into it and just getting in the car and driving to wherever..as far as I can go until the gas runs out..just getting the fuck up outta here and never coming back... Does anyone else ever feel like that? Is my discontent for my pretty decent situation normal? Or am I just some self-righteous sociopath with delusions of grandeur?