Is a flutter sensation in chest common in 19 yr old. i get them sometimes at rest sometimes at exercise. it doesn't happen often. it happens rarely?

See your doctor: No, a flutter sensation in your chest isn't common. It could be that your heart is having an arrhythmia, or abnormal heartbeat. Quite often, arrhythmias are benign and nothing to worry about, but some are more concerning. Please see your primary care doctor ASAP and she/he will do an exam, EKG, and further work up if needed. Be well!