First of all, 17 days is great for a person that is addicted to p*rn and m*st. In order to make it 17 days, do you realize how many times you had to say NO to the Evil Inclination!! The greatest tool of the Yetzer Hara, is to say "You only did 17 days, and then you fell. You might as well not even try!" The key is to not engage in a conversation with the yeter. The only way to deal with the yetzer is to tell him to take a hike.
You are saying that you are lost. Do you admit that lust is making your life unmanageable? Have you read the GYE Handbook? Although it is difficult, instead of checking out what your "missing" on the internet, make a goal to read the Handbook. Spend time on the forums seeing what others have done. I find, that the more time I spend on the GYE materials, the easier it gets to avoid triggers to lust. By the way, everything I am writing to you, I am writing to myself. I am no expert in these matters. In fact, most of what I am writing I have heard from this forum or my own Rabbi. By writing I am, hopefully, helping you, but am also helping myself. May Hashem Bless you.