Hi George,
I turned 28 this year myself and can relate to your struggle with pornography. You are certainly not alone. The fact you feel guilty as you do is a very good indication that God is working in you.
You may not know this scripture, but in revalation we are told, "and power was given unto the beast, to make war with the saints and overcome them." Paul says, "we wrestle not with flesh and blood but with principalities, with powers of darkness and spiritual wickedness in high places."
God has called and chosen you and began his good work in you and He will be the one to finish it, not you. You are the saint Goerge, and the beast inside you was given by the foreknowlesge and wisdom of God, power to make war with you and to overcome you. But Jesus is making His home in you and He has overcome the world, so be of good cheer and have faith that in due season you will be born of God.
You can search these forums my username and my previous posts of this very same struggle you now wrestle with. You may find amazing words of encouragements by others to myself in those threads. I know that many here were enouraging to myself and many of the older men could relate to the passions of youth as the lust of the flesh will still rear its ugly head in older age, but i have heard, less frequently than it does for us now.
It is a lesson in humility and patients. My lust for the flesh, naked women--Pornography--has been a crown of shame for me and it keeps me so very humble. Indeed I would find at times I was angry, Angry with the apostle Paul of all people. I mean how dare he call himself the worse sinner that ever lived, surely had he know this secret shame of mine, surely if he had met me, then surely he would have labeled me the chief of sinners. I mean, after all, Paul was caught up to paradise and was given such divine revelation, he was blessed enough to see the risen Lord Himself. I have never seen... but you see, paul slaughtered and wasted innocent lives, my pornography.. oh how foolish I was to try and steal paul's title but in all that, can you not see how God who in the blink of an eye converted the worst sinner to ever live into His greatest champion for the gospel, can certainly deal with our sins and make us white as snow? And did not Jesus say, blessed are they who yet having not seen still believe? This is you, this is me. We are blessed and our sins are no match for the Mighty God who see's who we shall be one day. A destiny He was willing to die for! He must see something amazing in us George to do that. Just you wait until He's done with us! While God is no respector of persons, we all must stand before the judgment seat of Christ, He does choose us and to be chosen now by Him does mean we are precious and special in His sight above all people of the earth. Take heart in that and know that there is now no condemnation to those who are in Christ Jesus, who walk not according tothe flesh but in spirit.
A righteouss man FALLS seven times... AND rises UP again!
God bless,
Alex
P.S. if you need a friend and have a facebook, id be more than willing to share in friendship there. Just let me know!