Thank you for the additional information.
The most common cause of chest pain or discomfort in a young adult is musculoskeletal inflammation involving the chest wall, such as costochondritis, inflammation of the joints at the ends of the ribs. It is common for it to be more symptomatic when performing activities that involve exertion using the arms, such as driving.
It is reasonable to be concerned about heart pain first, since heart disease can be very serious if not identified early. Similarly, certain lung
diseases also should be considered if there are lung symptoms, particularly if causing significant shortness of breath, although a little shortness of breath is not as worrisome.
At this point, it would be reasonable to manage it as musculoskeletal inflammation. It would be OK to take an over the counter anti-inflammatory medicine, such as ibuprofen or naproxen. It also can help to apply moist heat to the chest in the area of pain.
If I can provide any further information, please let me know.