Sudden chest pain. Felt this chest pain?

I've been having a sudden sharp, pain around the center of my chest for quite a while. I think first felt it around 3 to 4 years ago in middle school and I got very surprised at first but brushed it off afterwards. Then, it started becoming kind of often 2-3 times a month but I just kind of let it be. I never really know why I really felt this chest pain? It just comes at random times(when I'm walking, when I'm watching tv, etc.) I am adking this because about a few days ago I suddenly felt this pain longer than usual(it usually lasts around 15-20 seconds) but this time it lasted for about 2-3 minutes. I got kind of concerned but I don't know if it's anything serious that I need to check on to and tell my parents about because I am fine until now. If any doctor reading this could guess any possibility on what this pain could be, it would really really help a lot because I'm not sure if it's anything serious. Thanks a lot!