Do i have a burping problem?

i am 13, physically fit, but i cannot stop burping. it doesn't hit me as bad when i stand, but i will still burp once every ten minutes. but when i sit and lay down, i will burp like crazy, when i sit down, i can burp 400 times in 10-15 minutes. even worse laying down, i can't sleep. they are medium to small burps, but if i am laying down, and sit up, i will burp one or two big burps, and be ok for 30 seconds and it will start up again. sometimes things will come up, but it only gets to the back of my throat, but still burns. i had this since i moved to TN 9 months ago, i though it was stress/trauma form moving, but i moved back and i still burp. and as i said, i've had it for 9 months, and i am not an air swallower, but i was perfect before i moved. i though it was puberty, but all my friends that have gone through or going through say they haven't been burping, my voice has gotten deep, so i think i am done with puberty. everyone who has heard me or slept over has said it was very annoying, what should i do, i've tried ginger ale/soda, exercise, no exercise, water, no water, juices, yoga, stretches, raising my head when i sleep, lowering my head when i sleep. gurgling. also when i have a burping fit, it will build up until i swallow, when i take a sip or drink of anything, it will force a burp. changing positions while sleeping forces a burp too. but there is always 5 second pause between burps. i am normally casual and layed back, so it isn't a stress thing. nobody in my family or ancestors have had this, but my grandfather has heart problems, and i have a stills heart murmur. but i still do sports. i do my "business" regularly, what can it be and how do i get rid of it?