having "deep circles" under your eyes is usually not related to whether or not you wear contacts, or how old the contacts are, or whether or not your eyes itch or water or feel dry.
It is usually related to either the quality or quantity of your sleep (even if you sleep enough hours, you might not be getting the right TYPE of sleep), or it is caused by prolapsed orbital fat.
Try cold compresses in the morning, and making sure you sleep well. If after a few weeks there is NO improvement, you likely have prolapsed orbital fat, which is certainly not dangerous, but would only be resolved with surgery.
Based on your description of the problem, I'm 99% sure you have an allergies. Even if you haven't had allergies in the past, allergies can develop at any time and will make you very tired. So ideally you should see an allergist soon, and if he/she suggests allergy testing, an antihistamine, anti-allergy eye drops, and/or regular allergy shots, you should do that; you don't want to let allergies go on for years, or the blood vessels beneath your eyes can dilate permanently (and then you really can't get rid of the dark circles/puffiness). In the meantime, Estee Lauder's Advanced Night Repair Eye Recovery Complex does a good job of reducing dark circles/puffiness if you use it regularly.
As a more positive p.s. to my last note: I am 20 years older than you, but my own dark circles/puffiness look a lot better than they did 10 years ago (since I treated my own allergies); so don't despair--you are young enough that you can turn the situation around....