Going On It

I want to go on the pill or get the shot just to be extra safe when im with my boyfriend but i dont want my parents to know. They are both very religious and highly disaprove of sex before marriage. Is there a way to get on it without them knowing? If so who would I talk to about it and how much does it averagly run for? And also im a pretty active person and sometimes my period gets in the way, will certain birthcontrol methods stop my period?