Birth control

What the process of getting free birth control? I want to get started on birth control, but I can't let my mom or anyone in my family for that matter find out I'm sexually active. I know there are a lot of places who give out birth control with our parents, but I'm worried because I don't know the process of getting it. I'm also worried my mom will find out I'm taking it because she says she had a lot of mood swings while she took it. Can anyone offer some advice? Or info on the matter?