Birth Control

I'm 15 years old and me and my boyfriend are getting pretty serious, I'm not planning on doing anything, but I do worry sometimes about getting caught in the heat of the moment. I just want to know, what is taking birth control like? I have a few questions.

-Does it have side effects?

-If so what?

-How do I get it?

-Is it easy to keep a secret?

-Do I need a parent to get it?

-Where can I go to get it?

-How many are in each packet?

-Anything else I need to know?