You've got the talent, you've got the education but you have absolutely no desire to perform in public. Your love of the instrument is personal. You are the epitome of the introverted pianist. That does not mean however that you cannot have a career involving your beloved piano. There are a number of options to make decent money at the piano without having to tickle the ivories for a live audience.
Become a Piano Tuner/Technician
Imagine the joy you'll feel every time you take a dull-sounding, out-of-tune piano and turn it into the remarkable instrument it was intended to be. Piano tuners and technicians enjoy a rewarding career and make a good living once they develop a solid reputation and a loyal clientele. Piano tuners/technicians make a median of approximately $40,000 per year, with technicians working for performing art companies making approximately 50% more than that. Most piano tuner/technicians take a short course and then work as an apprentice until they are comfortable going out on their own. It helps if you've got a great musical ear and a penchant for woodworking. For more information, contact companies like the Minnesota School of Piano Technology.
Consider Writing Jingles
Although you may never make the kind of dough to afford Charlie Harper's beach house, you can still make a good living writing jingles for marketing companies or local radio and TV stations. For the most part you can work at home letting your creative juices flow and either submit the music with the recording or work with the company to record your jingle in the studio. Jingle writers can expect to make around $40,000 per year with those who get national contracts making three or four times that amount.
Teach Using Online Video Media
With a smart phone in everybody's pocket, it has never been easier to take piano lessons. Why not get in on the latest trend and post your own videos? The trick to be successful in this niche is to focus on an area that is not currently being taught. Instead of learn-to-play videos, teach more difficult techniques or little-known tricks. These videos are easily produced from the comfort of your own home and your audience need never see more than your hands on your piano keys. Once you've perfected the video, you need to post them on your social media sites, especially those specializing in piano and music. The more views, the more money you make. Basically, the more aggressive you market your teaching videos, the more success you will have.
Certainly if your passion is the piano, there is no need to get a regular 9 to 5 job in an industry that you detest. Simply thinking a little bit out of the box will open up entire career avenues that leave you happy, satisfied and making music your entire life.