Hello~It sounds very much like it is muscular related to me, the fact that it has been going on for two years leads me to think this. I don't think it is any thing to worry about, but, possibly seeing a chiropractor might be helpful, you may have some pulled muscles or pinched nerves in these areas causing the pain. The chiropractor will take some x-rays of the area, review them and then discuss the results with you and then give you adjustments that will help those areas.
I hope you feel better soon.
So, the really good news is that you are 15 and cardiovascular conditions aren't very common at your age. BUT, you should get checked. Does your mom or dad know about this and do you have an annual well check doctor's visit? Has this ever been discussed? This is a prickling sensation? Like possibly a nerve pinch?