I confess that I think about these and a thousand other things; I think what awaits him in this strange crazy world; I think about what he will decide to do when he comes of age and I hope he will decide to go abroad (to study or to work it will be up to him to choose).
In short, I think all the time and about a thousand things, but I think it's normal.
It is normal and each day will have new challenges and new thoughts. I am pretty sure that what you have learned so far in your life has taught you a lot that will help, but you will learn a lot more!