Abnormal Heartbeat At 15?

Hello and thanks for looking, it started about a day before labor day that my heart would have a few odd beats every once in a while, i thought it was just a rush and thought nothing of it, but on labor day i was sitting at my computer and it felt like my heart went to the middle of my chest and it beat probably at least 6 times within 2 seconds, in that short amount of time my mind went blank, and then it was over, it scared me and I didn't now what really happened, well about 2 min ago it happened again, heart felt like it was in the middle of my chest and beat very rapidly for about 3-4 seconds, no worse than the first, but im really wondering what this is from, i heard that taking magnesium could help, but i don't know.

Though im not too worried about it, when it happens I can get my heart under control pretty fast through deep breaths.

Anyway, thanks for reading and i hope i get some good answers.
Im a guy...and as of yet...not pregnant ;)
I guess it could possible be stress, that's also another thing that I saw online that caused it for some people, but I cant be very stressed, the only thing that gets me stressed is my parents, hardly anything they do just pisses me off. and on Friday I was working out at the YMCA, ran just over a mile, and bench pressed, so its possible.
Oh man, Im constantly thinking about a girlfriend, that takes up 80% of my thoughts now, but its not thinking about "her" because there is no "her", I dont have a gf, though I am always thinking about it because in a way im lonely, this POS town I live in has nothing to it, theres no where to go, Im developing a sort of hatred towards my parents, so I think getting a gf could help with that stuff, get me away from my normal routine, so I dont think thats the problem.