Fast heart rate, sharp pain when pressed on chest?

ive been having these real rapid heart beats, from like 98-108. im getting a little worried. i really dont know how i get this, sometimes, i get it from just walking a short distance. my bp is like 117/80 (estimate) when having these fast heart rates. anyone knows anything, im 16 and im 230 lbs, though i dont look like it lol. i have a fatty liver my doc said, and also im eating healthy, starting to. i also have this little sharp ache when i press on my chest on the left side. if i take. deep breath/cough, it doesnt trigger. please can someone help me? thank you for your time
 
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