Thanks for your question on Healthcare Magic.
I can understand your concern.
At your age of 13 years,
musculoskeletal pain is more likely for your symptom.
No need to worry for major heart and lung diseases. Anderson stop worrying about death.
Follow these steps for better symptomatic relief in musculoskeletal pain.
1. Avoid movements causing pain.
2. Avoid sudden jerky movements of chest.
3. Apply warm water pad on affected areas of chest.
4. Take painkiller and
muscle relaxant drugs like
ibuprofen and thiocolchicoside.
5. Avoid heavyweight lifting and strenuous exercise.
Don't worry, you will be alright with all these in 1-2 weeks.
Avoid
stress and tension, be relax and calm.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.