As already mentioned- you cannot take the road to becoming a professional pilot as a second choice or runner up as it were. To complete the training and fight for a job you must give it your all (and then some).
Genetics and in general a career in science is, quite frankly, easy compared to this. I know- I did it (Structural Biologist for eight years before I took the plunge). It's worth mentioning that you will realistically have to consider completing the PhD, after the BSc, should you wish to further progress in a science career to research level.
The training takes longer for a scientist (7 years) compared to a pilot (ca. 1.5-2 years) but you are guided every step of the way and the career progression is fairly logical and nicely set out for you. You also do not have to pay for the training costs! When you finish you are basically guaranteed a job with a wide variety of research groups to choose from.
Given your age, you have plenty of time to research, think and decide. I urge you to use this moment to make the choices that are best for you.
I wish you the best of luck in what ever you decide.
LG