THE GREATNESS IS THE WORK AND THE PAIN
I also was like you, a “Doeg”. Take a look at the entire Tehillim. Dovid is full of pain and worry; but he overcame his worry. The lesson of Tehillim is “Be a worker on yourself!" It's not the story of a perfect person, who had a smooth life. Dovid had the opposite of a smooth life! But he's always working on Bitachon. Do you want to be a Dovid? Be a worker on Bitachon. Don't become the "big Tzadik". Work! Try! And you'll get there too.
When we go through Tehilim, we see of all kinds of pain Dovid experienced throughout his life. But since he constantly ran to Hashem, he became a master Baal Bitachon, and was a happy person despite his problems
You'll get plenty big. Dovid got plenty big too. But the greatness is the work and the pain, which the whole Tehillim is full of. Dovid, you are such a Baal Bitachon; how can you have pain?