Song to song

I write songs. I don't know if their good. You should check out sometime. I'll make a YouTube account or something. But what I'm wondering is how I get "out there" . I just don't understand how say maranda Lambert or Blake shelton or katyperry or Taylor swift got out there so "easily". If you have any advice email me at 12thatgirl@gmail.com for any ANY information you have .... Please.