Greetings, brothers!
I don't know how to start this conversation, but I guess I will say a little about myself. I wasn't born an orthodox family but B"H, got to learn Torah and start doing mitzvot by myself, thanks to internet (it's no joke, kedushat internet!
). Now I do have a rabbi with whom I often study, but this topic of guarding your eyes which should be more mussar than anything else never appeared. I suppose I progressed a little.
Even before knowing about this great site, I already got acquainted with the concept of shmirat habrit. To me it never really made much sense (thought it was exaggeration), because I never felt anything bad happening after a "fall" (which I never considered it).
As it happened though, I began studying and doing mitzvot more. Often, but not always, went to shacharit in the synagogue. But I'm not here to brag about it. What happened then, in my quest for closeness to Hashem, is that all the bad things the yetzer harah does started killing me from the inside. I couldn't pray as well as I used to do when I got to a small streak (1 week, that was a great accomplishment for me). I pronounced words that seemed empty of all kavanah, that I was sure wouldn't be heard. I began to become desensitized, all my mitzvot performance went DOWN. I couldn't get myself to even smile to my parents (which is a form of kibud av va'em), or concentrate on anything.
I found out a few important things: keeping myself tired will protect me from doing bad things in the shower. I mean REALLY TIRED. As I began working on self improvement, I learned that the great tzaddikim could sleep only for 4 or less hours everyday and then it hit me. It's all the Yesod! Pgam haBrit lowers our stamina and destroys us from the inside. I felt this lack of strengh a lot, and that was terrifying! Often I couldn't wake up the time I wanted and missed the time for shema.
But, as we should all know, there's fixing and B"H for that. As the Rambam says, children should start learning Torah Lo Lishmah, and eventually they will come to learn it Lishmah, which is of course the ideal. I do believe shemirat habrit is the same. At least the way I felt it is that, the real love comes AFTER shemirat habrit, where we keep it for Hashem's own sake.
I wish everyone here that you fight the good fight, and become the real strong, "hakovesh et itzro" because I do believe we can all do great things. However you choose to discipline yourself, we are all sure to be able to fight the yetzer harah, with Hashem's help.