I had heart failure in my 30s, luckily I went to the doc to get a shortness of breath checked out and have been on medication ever since. (My heart was enlarged, getting harder, basically dying and and I had a resting heart rate of 110bpm).
All from an arrhythmia which they've since tried to "zap" back into a regular rate but failed.
My yearly echocardiogram is tomorrow.
Still counting down the next month and a half out day by day as both my grandfather and cousin died at exactly the same age I am now but being on blood thinners I'm probably less likely to have an issue than the average Joe.
Definitely go see your doc if you suspect anything abnormal in your chest or with your breathing, it's the biggest killer around.