Do you have any other symptoms?Any fever breathlessness? How long this heaviness has been there? Is it increased by walking or physical activity
There can be multiple causes of heaviness in chest for a young person like you ranging from musculoskeletal to gastric to cardiac to respiratory. Usually at this age the harmless causes are more common unless you have any other risk factors.
Next Steps
Seek consultation with a doctor for evaluation
Evaluation may include checking your vitals and doing ECG or chest x ray after assessing the nature of pain and detailed history of your symptoms.