Fast Heartbeat

I'm 19 and as long as I can remember I've had a faster than normal heartbeat. I get short of breath quickly after mediocre physical activity, and am usually tired for most of the day because i don't seem to sleep well, but I don't know if this has any correlation. I've had my blood pressure checked a couple times since the beginning of the year and it is normal, but the first time my heart rate read as 92 beats a minute and the second time it was 93. I can feel it beating fast all day and there is slight pressure in my chest.. I know that it's usually only serious if the heart rate is over 100, but I was just wondering if this was anything to worry about?