Hello SharaT, I also hope you don't have CML, but you can get CML even if you are young, I'm 22 for instance, and I know some people who got it at 16.
For diagnosis you need a bmb to see if you have the mutant "philadelphie" chromosome.
If it eventually turns out that you actually have CML try not to panic by now the treatments are very effective, some people like me even don't have any side effects and life expectancy should be normal
good luck !
Pierre