Hi past 24 hours been having very sharp sudden stabbing pain left chest/breast area it can be isolated stab or have 10 in 5 minutes. no other symptomes. im scared its my heart?

Usually, a stabbing pain tends to be a musculoskeletal issue like a muscle, cartilage inflammation of the chest wall. A heart pain tends to be an intense ache that lasts longer than seconds. What are you doing when this pain comes on? Are there any other symptoms, like shortness of breath? If you are concerned, you should see a doctor to evaluate you, get an EKG and give a diagnosis. Good luck!