There is not a medication for depression
that works instantly.
Medications for depression work by correcting chemical imbalances in the brain, and this takes time.
When some people first start taking depression medication, one of the side effects could include feeling more depressed. Keep your parents aprised of your symptoms because if these feelings persist, then your treatment regimen may need to be changed.
The fact is, one day a few weeks from now, you'll be going about your business and you will realize that you are not so sad anymore and you feel calm and content. It will be the first sign that the medication is finally working.
Take your medication daily, don't miss a day. Ofcourse if you miss a day, do not double up pills, just take your next dose at the time you are supposed to.
The medications typically work. Good for you for being proactive. I realize you wish for an instant cure to depression. Stay strong and allow the medication to build up in your system.