What should I do to get checked for heart disease (i'm 25)?

See you Doctor. There are many types of heart disease, but most are unusual in young people. However if you have a sensation of an irregular heart beat, unusual shortness of breath with exertion, chest pains, lightheadedness or fainting, see your doctor. He / she will examine your heart and determine if any other tests are needed such as an ecg, or echocardiogram.