I had the same problem. I originally applied for AdSense for my own website and was denied. Then I started writing on HubPages and built up some content here so I could apply to be approved for HubPages instead, but it wouldn't let me. My website was already "in process" or something. Probably whatever message you're getting. Well, since I'd been wanting to work on improving my website anyway, I did that. I stopped writing for HP and updated the content on my own website.
But I had two other side issues as well. The next time I tried to get approved, I realized that Google thought I was under 18 and was never going to approve me because of that. I had entered the wrong birth year when I created my account, and try as I might, there was literally no way to change my birthdate. They just won't let you. MAN was that frustrating! So . . . I didn't know if this would screw me up further with Google being Nazi's and all . . . but I deleted my Google account and recreated a new one with the same email address. I could have made a new email address and a new separate account, but I really didn't want another email address. Well, it worked. I was then able to reapply for AdSense and could have used either my website or HP for "content to monetize". I went ahead and used my website and was approved.
But wouldn't you know, it was a wordpress.com site and I quickly learned that wordpress.com doesn't allow you to monetize! Ugh! So then I wished I'd had my HP monetized! And yet, since I did want my website monetized, I was then thrown into the frenzy of creating a brand new self hosted site on wordpress.org.
That last part was just bonus info that has nothing to do with your question. :) But to answer your question, you might want to try creating a new Google account, either with a new email address, or canceling the old account and recreating it with the same address. I'm not responsible if what worked for me doesn't work for you though!