Hello,
I was in pretty much the same situation you're in now. I had only realised my desire to play piano at 14 years old, and you do feel disadvantaged when you see nine-year-olds playing Chopin etudes all over the internet, but don't be discouraged. You don't have to complete every grade in order (I did the 5th grade after one year with a teacher), and you MUST practice all the technique: scales, arpeggios etc. To fast-track this, I would recommend Hanon's 'The Virtuoso Pianist in 60 exercises' (everyone says Hanon is torture, but it really isn't, it's actually highly beneficial to technique), in combination with other pieces that will help in development. Also, on your first lesson tell your teacher your ambitions and make sure they are aware of your goals, and if the teacher is good enough, they will help you. Please remember that teachers usually know best, and even if they give you a hard Bach piece that seems monotonous, uninteresting or boring, it will help you play the pieces you aspire to.
I learned Rach's C-Sharp prelude after about two and a half years, with a lot of devotion to practice. The main trap people in your situation (in fact, almost ALL situations) fall into is comparing yourselves to others. Don't do this. It does nothing for your skill or self-esteem. Playing piano takes a lifetime of hard work and mental strength, but its benefits far outweigh the negatives.
On another note, fourteen is not too old at all to start playing. You get some people starting in their 30's, 40's, 60's, 70's...you have a whole life ahead of you with the potential to be filled with music! Keep it up and best of luck to you.