Hi I am a teen my age is 13yrs I feel a small pain...

causes and management of chest pain
Chest pain sensation  could be a result of maultiple factors and underlying causes, among these is the muscualr pain which is a feeling of pain upon breathing that might cause chest discomfort and pain and it will be treated with Local application of Ice gel 3 times a day in addition to the use of Orphinidrine Citrate tab twice daily to releive the spasm . Other possible causes include stomach ulcers and inflammation with inceased gastric acid secretion which increase with eating and it should be treated with Ranitidine 150 mg tab twice a day. Heart problems are rare at this young age group and should be excluded if symptomes perisisted with a consultation of your treating family doctor . If there where a history of contact with COVID 19 infected patients its highly suspected that you could have infected so you should stay home and do the proper exams.
Required Investigations 
After doing a proper clinical exam, a chest X ray should be done to exclude any signs of chest infection, CBC  to detect any rise in WBC as a clue of chest infection. ECG  to detect any irregularity in heart beat , Preferably Holter ECG which do a continious monitoring of Heart beat through the day. Gastroscopy could be done to detect any signs of peptic ulcer disease . pcr to detect COVID19
 Causes 

• Musclur spasm 
• Chest infection 
• Heart rhythm errors 
• Gastritis 
• Hiatus hernia 
• COVID 19 

Our advice 
You are adviced to avoid stress and drinking caffiene containing drinks, avoid cold air flow and have a well balanced diet, have exercise regularly, avoid crowded situlations where you can got COVID 19 infection, wear mask and wash your hands properly