Looks like you are having ventricular ectopic. Which may or may not be associated with heart disease at your age. It could even be related to some systemic illnesses like anemia or thyroid problem. You need to see a cardiologist, have ECG eccho and if necessary have holter monitoring done. Based on the result cardiologist will decide if arrhythmia is significant and if it needs treatment and further evaluation or is benign thing and doesn't require any treatment other than symptoms