are you serious or just kidding?
You can not give yourself a diagnosis, such as Angina, MI(STEMI OR NONSTEMI),or arrhythmia, unless you have serious tests done. You can only describe your symptoms to the doctor, and let them tell you the results.
If you are young and it is not the first time you experience those symptoms, you should take it seriously. Smoking, alcohol, and stress also contribute to it.