Difficulties on the path

Dear Dhanajay,

My heart lies in the practice of the eight limbs of yoga.
There are other good things in the world, but I know that all of these are secondary to the highest practice of yoga.

When I practice yoga, I know I'm doing the highest good for myself and others.

This past year I've taken to the primary series of asana in the tradition of k pattabhi jois.  I also have a fairly consistent sitting meditation practice.  

However, I find the yamas and niyamas of yoga and the sila of buddhism to be of a much greater importance than the asana and the one that gives me greatest difficulty is brahmacharya.

Before finding yoga & buddhism, I had heard about this thing called "nofap" and had tried to give up pornography and masturbation.  With a full year of attempts, I could make it to 6 days only a few times before losing it.  I didn't realize how habituated to it I had become.

The past six months or so my records have increased.  Recently I made it just under three weeks, but I've fallen back into looking into pornography and masturbating the past few days.  I feel like such a total hypocrite.  My heart says yoga is what I should be doing, and here I am doing all these asanas, yet I'm so clearly addicted to masturbation and pornography.  & both yoga & buddhism say the bridge of sexuality is to be cut off.

Sometimes, because of my failings at total brahmacharya, I think I should strive to reduce sexuality only at first or switch to real sex at a later date, but I see that this would only create more problems for me and is not honest.

What I'm doing right now in faliing brahmacharya is unhealthy even for a worldly man and totally contrary to my spiritual aspirations.  I could feel the loss of stability in my meditation.  I'm more agitated now and filled with anxiety.
I want to abandon sexuality completely.
In my clearer moments I'm baffled as to why I'm attracted to it at all.

I sleep on the floor, have satsanga when I can and don't hang out with old vulgar friends and acquaintances, take vigorous asana 4-6 times a week, meditate most days at least one hour per day, and I watch my diet.  I keep a diary also.

I'm so frustrated by my lack of success here.  Before my lapse at day 20 I felt impervious to the attaction but since my fall, I've had many more lapses and have been unable to get going again.

Should I attempt a graded approach to cutting out sexuality or strive for full brahmacharya from the outset?
What should I expect to really have success in this?
I don't want to live the course of my life without being established in brahmacharya.  What a pity that would be.