First, I highly highly recommend you ask your parents to take you to a dermatologist rather than asking here. No one here can tell if you have hairloss without proper equipment.
Your hairline most likely looked like that for the longest time. I've had many friends who have your hairline at your age and they've stayed that way for forever so don't panic at all. You also have naturally thin hair which can make you think you are balding even when you are not.
I also know many many teenagers who are balding but don't even know it because it's very common and natural. We often think that balding people are those with no hair at all. But actually, people lose hair throughout their life. So everyone is actually balding to an extent.
Secondly, please please please stay off this website. Many people on here are very depressed and want to make you feel horrible. This website is about researching new treatments for hairloss which should not concern you. This is because you are very young, by the time you are bald, there will already be a cure to hairloss. This is something your generation will never have to worry about.
Finally, I really do not think you are balding and you will not have to worry for many many years to come. Your doctor is best qualified to take care of you. But if your doctor prescribes you any medication that you want to know more about, feel free to message me directly.
I do not want to see you on this forum again. There are sections of this forum dedicated to depressed and lonely men to vent that no one, regardless of age, should be exposed to. I, myself, try to stay away from these sections.
If you still want to keep up with the research that we are making in hairloss visit folliclethought.com. They have a much better summary of the research. This forum discusses personal experiences with new treatments, costs, and safety concerns which is less important and informative.