Getting Rid of Cynophobia?

So, I've been afraid of dogs since I was about six years old. There is no real reason for it, but I guess I'm afraid of them because I didn't really grow up with or around dogs, so I wasn't sure what to think of them. If I see somebody walking their dog down the same street as I am, I have to cross the street. I can't really go to my friends' houses because ALL of them have dogs. It's very difficult for me to actually tell my friends about my fear cause I think they'd make fun of me or something. Now that I am in high school I want to be a normal teenager. I don't want to be avoiding dogs all the time, it takes away from the fun of hanging out with my friends. How do I get rid of this phobia? Thanks for your help(: