Such a fascinating subject to me... I have gone back and forth over the last 10+ years, trying to really understand what it is I want to do.
I hope you don't babble cause it might get long... but I am trying to make a point
So... in Israel things are a bit different- you finish highschool, and while your performance and choice of "majors" have some extent of effect, these are incredibly irrelevant when compared to our Psychometric exam... which is the exam you have to take when you choose a college/profession etc- it is supposed to predict the likelihood of you succeeding but doesn't really do it well. At any rate, you can technically do very poorly in highschool, but ace this exam... and all the doors will be open to you.
ANYWAYS, school was always important to me... I know friends who did invest allot of effort during that time, and friends who did not... and honestly? I don't think the implications were that significant either way... nothing was beyond fixing. I don't really believe that high school has that much of a bearing on your future financial success... I think it has allot more to do with personal skills, dedication as an adult, choice of profession... and yeah... luck.
Now... I tend to believe that when you choose a profession that really interests you, and really fits you- a profession that you can shine in because you have a natural affinity and aptitude with, your likelihood of succeeding is very high. The challenge is to actually find the right choice, I think.
Ever since I was a kid, I -knew- I was going to be a vet(well, when I was really young I wanted to be a dinosaur scientist hehehe, but you know...).
So, we start later here... there's a 3 years mandatory military service term for men... so I "started out" when I was 21.
Prior to committing myself to a 7 years worth of school, I wanted to see how if it was for me... so I took a vet technician course(1 year). I did fairly well... prior to graduating I got accepted to work for a respected clinic.
During school I participated in surgery, treatments... I really did well, I was sure I found my calling. And... sure enough, one week after working in a clinic , I quit (did you see that coming?).
The moral dilemmas I faced, and being in the proximity of allot of sick, suffering animals... that was too much for me( I also did not get along with some of the staff, admittedly, but I could simply look for another clinic).
So... there I was, at 22, having finished vet tech training but without interest to pursue the profession. During this time I also worked as a customer service representative to pay for bills and rent.
So... I decided to pursue a BA in business management. This is a general degree here which opens allot of doors without closing too many others... I knew at that point that I didn't know what I wanted to do with my life, so I needed something practical, which will also give me the time I need to consider my options.
I don't know if my choice of degree tipped the scales or not, but I got a far better job on my second year in college, which improved things quite a bit...
Over the next few years of working+studying I really searched and searched... I tried learning alternative medicine... once I finished my degree I even enrolled to Chinese Medicine training(4 years) and thankfully, the college closed a month after I started... for years I was sure alternative medicine was for me, but as I got a bit older, and a bit more of a critical thinker... I simply couldn't see myself go through so much training, and take money from people, for something which has yet to be proved to be anything beyond Placebo...
After spending 6 more months of serious soul searching, I enrolled to AAT(animal assisted therapy)- it requires a first degree, which I already have, and it simply fit every single criteria... it took me close to 10 years to reach this point.
So... what I am saying is... it is OK to be undecided. It is OK to enjoy youth... more than OK... these years are not coming back.
If you have a flare for business and making money, and you commit yourself to it, you will succeed financially regardless of how you do in high school.... it is not really "too late", ever... especially not at such a young age.
Sure, "starting strong" in high-school might provide an edge... but with enough dedication, you can do just as well without acing high-school.
You will get older, you will change... because these are years filled with them... your standards and definition for success will be different... money won't necessarily remain your number one goal... I find that as people get older, they aspire to fully express their abilities... to make full use of this short life-time of ours and do everything we can do... so that when the time comes, we can look back and be without regret.
So... chill out, take a breath and enjoy life as it comes. Perspective will change with time, and so will your priorities... they will shift, and shift again, and again...
Do not berate yourself if things aren't going according to plan... you are completely free and capable of changing your circumstances, now and later... there is no need to fear that every single misstep will ruin your entire future... because it doesn't really work like that.
Best of luck, I hope I didn't SERIOUSLY bore you.