Sometimes i get a mild pain in my left side next to breast. could this be angina or related to my anxiety?

Chest pain : Chest pain outside the nipple line is rarely cardiac in origin. More likely is intercostal muscle pain or radiculopathy or irritation from a pulmonary source if you have pain when taking a deep breath in. You are also a young woman and unlikely to have angina without significant history or risk factors. Please see your MD for a physical exam.