Panic Attacks

I have been experiencing anxiety attacks or panic attacks a lot lately. and i do not know what they are caused by. i am lucky that i am surrounded by people who know how to handle my attacks, but i feel incredibly self concious and embarrased after one. i am under 18 and i have not told my parents and they are not around much to help anyways…any advice? Also my parents don’t know how to handle things like these. Any suggestions about them either?