I'm flying internationally and its my first time flying by myself,and I'm Scared!?

What i did for my mom who usually hates flying alone is for u to look for someone older that is on the same flight as u and attach yourself to him or her after clearing security.

There's nothing to worry about. Will your parents but coming to the airport with you? if so, then they will take you to check in your luggage and collect your ticket. also, you can simply tell the airline staff at the check-in station that you are unsure of what to do. They will be more than happy to help. Once you have dropped of your luggage, head to "Departures". Here they will most likely check your ticket and scan your on-board luggage. Once you go passed this point your parents will not be able to go with you. Dont worry, all u have to do is find your Departure Gate (this will be written on your ticket I imagine). Once you know where it is you will have to wait until they start boarding, take note of the P.A. announcement over the speakers. When you hear you're flight number called just start lining up at you Departure Gate and follow the que.

ask help to the staff of the airport. there's nothing to be scared of

You will be fine. The staff should be notified that you are an 'un-accompanied minor' and will be very nice and helpful.