There are plenty of people that feel as you do. Anything to do with the heart generally makes people nervous. I'm one of the lucky ones because I've had wacky heart beats all my life so it's "normal" to me.
I do believe stress/anxiety can trigger more arrhythmias. When I'm very tired, overheated, stressed about something, my heart will act up more than usual. But on the days when I'm happy and relaxed, so is my heart. We can't avoid stress all together because life throws us a curve now and then. But we can find ways to calm down. Some people do deep breathing (didn't work for me), going for a walk or just distracting ourselves with something we do like. That's my favorite. :-)
Hope you find something that calms you and eases your dancing heart.
I have been on this forum since 2002 I have nsvt, svt and pvcs and pacs and yes I am very heart aware.. It makes me crazy.... and my doctors too. I do see a counsler for it have for years sometimes im good sometimes not so good. With ten yrs under my belt I have mellowed some with it, but if I have a bad run it sends me through the roof. some folks dont pay attention or they just think its normal.. I wish I could be more like that.
I would say there are, oh, about a bazillion people who go a tad phobic or obsessive due to hyperawareness of their hearts. I'm certainly one of them, and I've seen and responded to a lot of messages here from people who have this problem.
Some of us humans are delicate folks. We are like the Princess and the Pea: We are aware of lumps and bumps and noises that most people cannot even perceive. And it makes us REAL nervous!
I saw a nice shrink about this. He helped me immensely.