Everything you say or allow into your eyes or ears becomes data that is stored in your heart. That data is later replayed during your prayer. If you want to know what is filling your heart, look at what you think about in your prayer. If you want to guard your heart, guard your eyes, ears, and tongue.
Never lose hope. Stay close to Allah and when you mess up, go back to Him. Never, ever stop going back to Him. Repent often. Cry to Allah. And hold on tight-with your life-to His remembrance and to prayer. If you do this, you may get wet, but insha Allah never drown in this ocean of dunya.
If you want to focus more on Allah in your prayers, focus more on Him outside your prayers.
On that Day, we will see the true reality. On that Day, we will realize that two rak`at (units) of prayer were greater than everything in the heavens and the earth. We will realize the priceless check that was left on our doorstep every night as we slept. There will come a day when we would give up everything under the sky just to come back and pray those two rak`at.
Sigh... I have learned that *everything* is so hard...except what Allah makes easy. So we must *beg* Him to make it easy on us.