Bruno,
The problem of becoming a pilot is that it takes up your life. All we do is eat, sleep and poop aviation. Once it's in your blood I'm afraid you can't go back.
Personally, I couldn't afford to be a pilot when I was your age. I had to work a really crappy IT job for 7 years before I had enough saved to pay for my training. Mind you, once I had the necessary cash I was out the door quicker than a scolded cat. What kept me going through the training was that I was determined not to have to go back to IT.
Anyway, what I'm trying to get at in a roundabout way is that it's not easy. You will have days when you wonder what on earth you are wasting you money for. This whole website is full of people who have gone through the mill, had the same questions you have right now and ended up flying round the skies for a living.