I need to runaway, but...?

Last night I made a plan, I am going to get out of my house some how and go to a police station and tell them what my family does to me. They verbally abuse me, and sometimes physically, and my dad sexually abused me once. I think he's a perv. anyway, I was planning on doing this today, but I love my brother with all my heart and it's his birthday today so I can't do it today because I don't know what would happen and I don't want to ruin his birthday because he loves my dad so much. AND the police station is reeeaaaaaalllllly far away from my house, and I have no way to get there I'm sure my parents would find me before I got there. and, I'm just scared to do it, maybe I should get a friend to come with me or something... any advice?