Am I too young to be nervous about my career?

no .. you are experiencing the pefect fear and anxiety for your age. you’re right on track. especially since your perplexity is over deciding into which direction to channel your efforts .. this is an age (15 - 17) when the way of thinking that the individual has experienced up to now is pulled out from under by the body’s need to develope new chemicals and enzymes that total frig out the baby’s brain. The only thing you do need to hold on to in order to maintain your sanity during these trying times is the awareness of your inherent goodness and purity .. walk in beauty, and trust that this growing pain, too, shall pass. (ps. Astronomy will maintain your youthful spirit forever .. it does mine ;-)

At your age your best bet is not to get anxious about your career choice but to work hard in school to keep all your options open.

I changed my mind several times before I settled on my current career. A rather embarassing number of people end up in fields far different than what they went to college for.

Its not normal but i think its smart im 14 and im doing the same. its smart to know what your going to do in high school and collage in education its first come first serve and ive learned from that second guessing your self can be helpful and anoying at the same time.

good luck!