I don't think anyone here can give you particularly reasonable advice, as only some of us have even gotten to that point of having a career (and I don't just mean a job, mind you).
However, all of us should be able to agree that 14 is a tad early to decide your life goal just yet. Focus on getting a stable career path first and make some decent money to support yourself and your dream. It takes a lot more than talent to break into the music industry, you need a large amount of luck to even get close to succeeding.
My advice would be to look at the things besides music that you're good at; practical, real world applicable skills you can focus your education on and get a job doing. Then, when you've made money, buy equipment and record some demo disks and get yourself noticed locally and then work your way up.
My answer, in tl;dr fashion is: yes, focus on your career, but not in something as far fetched as a rapper.