I always get scared like that. When my teacher was diagnosed to have a brain tumor, every time i had a headache i was scared to have one too.
Same thing when a guy at my school had chest pains and suddenly died in his sleep, every time my chest hurts im scared the same thing is going to happen to me.
I think it's all to do with your subconscious. I think it's nothing and like you said it's very rare in teens. If you are still worried i would go see a doctor.
Hope i helped Salv
