I've been experiencing chest pain for a while now and i'm a 25 year old female. usually it's sudden or achy pains. sometimes it's accompanied by acid ?

Multiple causes: Chest pain can be a symptom of heart disease but may be may other things such as esophageal spasms, gastritis or reflux, respiratory disorders (asthma, COPD, bronchitis, infections), and muscle problems to name a few. It really depends on the clinical situation and other symptoms you may be having. At you age it is unlikely to be of a serious nature but if concerned discuss with your doctor.