Teens: I feel worried,exercise?

Hello. Okay so I was walking about 5/10 mins and then when I got back from the walk..I felt this weird feeling In my chect (heart) ...I hardly ever exercise!. And I'm quite lazy. So what do you think It could be? and should I exercise more? (I'm overweight) and I have no exercise at all..basically. Also what happens If I don't get enough exercise?
 
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