Health issues because of computer

More sleep, less time in front of screen. At least look away from the screen more often.

Or

Cosmetics.

By the time you get our age it won't even be noticeable.

If 8.25 hours was enough sleep and you had enough down time from the screen the circles would be gone.

So the cure is simple as already stated by smarteyeball.

Try using Mom's make-up for sagging skin/wrinkles at bedtime.
Also slices of cucumbers placed over the eyes is suppose to help.

Try to take breaks after spending an hour on computer by going for short walks. Refreshes your mind and body.
THW

may i share my experience here ? as i am almost your age :) how are your eating habits?
i had the same issue a year back. i got a job & my work is where i have to be in front of the computer for 9.00am to 6.00pm (9 hours) & when i get back home, i'm on the computer till i go to bed. (i sleep mostly by 12.30 am sometimes 1.00am). the difference that made the dark circles go away were my eating habits (i used to eat less that time, compared to how much i eat now, bad appetite! & people still say me to eat more), & since i started work i am so tired that, when i go to bed i fall asleep instantly or within 5/10 minutes. hope this helps some :).

noskas16 said:

I do understand that, I am just asking if anyone knows any alternatives, for example, what kind of vitamins should I use, or maybe there is some medicine to us. As I said: I can't change my life style :/.

Bold words indeed, I felt the same way when I was your age. Invincible!

And you want to be a programmer? You keep going the way you are, and you will be burned out by the time you reach thirty-five.

An interesting look at common Programmer health problems:
Shedding Bikes: Programming Culture And Philosophy

The technical on Dark eyes:
Infraorbital Dark Circles: Definition, Causes, and Treatment Options - ROH - 2009 - Dermatologic Surgery - Wiley Online Library

Some Thoughts:
Do you keep hydrated?
Drink more water. 8-10 glasses per day, no excuses. Water helps to cleanse your body of impurities, which can contribute to dark eye circles.

Do you have chronic (read:infected) sinus problems?
You will need to see a doctor for this.

Do you have allergies?
Related to sinus, but caused by outside factors, like, animals, dust, molds, food, plants, perfumes, dyes, bathroom soaps, even something as mundane as the type of laundry detergent you use.

Do you have a healthy diet?
You asked about vitamins.
E, K, and antioxidants help, but if you have a well rounded diet you can get these in your meals.
E, and K can be toxic if taken in large doses.

You may not think it, but it sounds like you are already under a good deal of Stress:
Understanding Stress: Symptoms, Signs, Causes, and Effects

See also, links near bottom of page:
Home Remedies for Dark Circles, Under Eye Treatment

Tips on reducing workstation fatigue:
HealthyComputing - The Premier Source For Computer and Office Ergonomics

Do not forget, you are in this for the long haul, you have 70, 80, maybe even 90 years ahead of you, and you need to start developing healthy habits now.

Remember these words:
If you will not change your lifestyle, then your lifestyle will certainly change you.