I don't know how genuine is your posting but there is a way out from this. The good things is you have realized you are in a mess and you want to get out of this mess. That's good. That's the first step. Now you need to move on 2nd, 3rd, 4th... steps gradually. Our mind is always hungry of experiences. If you feed it and if it likes it, it wants it more. This creates a groove in our mind. We call this, in the language of Psychology, habits. It is extremely difficult to get out of the old mental grooves; however, it is possible. Many people have advice you to do exercise, run, weight lift etc. This is very helpful as running decreases depression and exercise helps to tone up you body and make you relax. However, your problem is not body oriented. Your problem is mind oriented. Therefore, you need something that can alter the old grooves that you have created as a result of past and present karmas. The yoga sutras of Patanjali clearly prescribes Yama, Dama, Niyama, Pranayama, Pratyahara, Dhyana, Samadhi etc for individualized mind. When your individualized mind unites with the Virat Purusha or Hiranyagarbha of Vedanta you will experience the infinitude of bliss. Here is what you need to do:

1) Bring a strong WILL: that you need to change for good and you must do it. This is very difficult. Keep bringing this thoughts in your mind until it gets a momentum.
2) Wake up around 5 or 6, become fresh and do some light exercise for about 10 minute.
3) Then, sit down either in Sukhasana, Siddhasana, or Padmasana. It seems like you need a lot of vital energy. So, I recommend you start doing "Prana Mudra." When you do this mudra, you will experience jolt of currents following through your spine. Don't panic, just relax.
3) Now, with spine erect, do some simple pranayamas. Open your ventilations and let the fresh air enter your room. Now, start with 2) Bhastrika Pranayama then, b) Kapalbhati Pranayama and then c) Anuloma Viloma Pranayama. (There must be alteast 15 min. gap between asanas and pranayamas and dhayana).
4) Now, after doing all these pranayamas, relax your body for at least 15 min. Now, you can also change your mudra. Bring Gyana mudra or Purna Gyan mudra. Be in Sukhasana, or Siddhasana, or Padmasana. Close your eyes, bring your attention to the rhythm of your breath. Feel the air as it touches the nose when you inhale and feel the touch when you exhale. Do, this dhaya for at least 20 min. every day. (Note: all this must be done in empty stomach.) I recommend you start with all this. After practicing this for a month, you will be a new gentlemen. Your desire for porn will slowly go away. There will be more vital energy in your body as a result of prana mudra and pranayama. Slowly you can also start Mantra meditation which is more advanced than breathing awareness dhyana. But for now, start with this.

Hope you will blossom like a fresh flower and enjoy the total creative potential of Brahman. Om Tat Sat.