Designated path; Road to success?

My life just took a beating to the head.
Is there a road, calculated time, that leads to success? Must one be in line with every other being in other to be accepted?
In Singapore, the smarter kids serve their National Service at the age of 19, 20 tops.
The middle range kids, serve their National Service(NS) at the age of 20.
The not so clever kids, serve their National Service at the age of 19, 20 tops.


Now, this above are three of the many many roads in life. But there are special cases in which the roads are bent, which take longer or maybe shorter to achieve the specific target.

I, belong to the middle range kids, and I'm going to serve the National Service at the age of 21.
Because I just found out that I failed two of my 5 modules this semester, and I am going to be staying in the school for half an additional semester, while my friends are fresh graduates enjoying their long holidays before they get enlisted to NS. I am thoroughly angered and disappointed because, I was very, and I mean VERY, confident for one of the module. I was so confident I taught my friends the hour before the exam started. And guess what, my friend passed and I failed. I thought it was a cruel April fools' prank, but today is the 7th of April. No one plays a prank so late into the start of April. I'm tired, I'm sad, I'm so angry I wanna just quit school so that I can be in the "line", where my life was supposed to be at. I don't wanna waste half an additional year taking new modules and having to wake up early to go to school, and spending money to go to school, while every single one of my friend is partying their nights away.
Fuck this shit, I need a break.