" if he has read my post properly " that is a problem with a lot of idiots on-line, they half read something, and then get typing and vent their spleen over something you did NOT say, or do, it is their laziness to blame.
Do not berate yourself for your fling with the young lady, these things happen at that age. You were a boy, not an Adult. O.K , at that age we still know it is very ill-advised to have sex, but in the heat of the moment, it happens.
I advise you to thoroughly examine the teachings and practices of the J.W's, and then any guilt will leave you, they do not have, or teach, Truth.
I did that, and successfully expunged my JW personality, and thoughts, and fears, and now I am 100% "worldly", it is as though that young man I was as a J.W was someone else !
Which is true, as you found, when we are "in" to any degree, we cannot be who we really are.
I am now the Real Me, and a Happy Humanist Atheist.
All the very best for a bright, fulfilling future, free of any Evil J.W influence !