Glode,
Welcome to the discussion group. I'm glad you find it interesting, as your title says. I hope you hang around a while longer, there's a lot more to learn!
Your experience indicates that certain standards are not applied equally across the organization. (1) Staying late at your girl friend's house, that would get you called into the conference room in many congregations. (2) Your GF played on her high school teams. If you read the brochure "School and JW's", I believe that's the one that specifically outlines the fact that JW's don't participate in extra-curricular activities. (Their real reason, it takes away from your time for study & ministry. (3) You attend R rated movies, which if you are in the USA, means no children can attend these unchaperoned. However, at age 20 you are expected to be "reaching out" for the position/privilege/whatever of Ministerial Servant. Another however: where I came from, if you were seen attending R rated movies, it would call your qualifications into question.
About the doctrinal changes and "thinking for yourself": You surely understand that if you express doubts about what the WT Society teaches as the "current truth", you will be viewed with suspicion, possibly questioned for apostasy. (Again, things may be more liberal where you are, but I am speaking of the majority of places). I'm glad you say you "think for yourself", and view unprovable teachings as only opinion. But that is at odds with the loyalty expected by the organization. They have clearly stated that loyal JW's accept the WHOLE RANGE of teachings that are unique to the JW's.
Because of some of the above inflexibilities & inconsistencies, along with "bad experiences" you alluded to, many reasonable people who were once loyal to the WT Society have concluded (1) it is not the solid foundation of truth it claims to be (because that "truth" keeps going back and forth), and (2) the love Jesus said would mark true Christians, real unconditional love, is unfortunately not the mark of JW's. They keep their people in check by means of "fear", fear of marking, shunning and disfellowshipping. As stated in the Greek Scriptures "There is no fear in LOVE, for perfect LOVE throws fear outside".
Some things to think about. I enjoyed your post.
GopherIt is not best that we all should think alike, it is differences of opinion that make horse races.
Mark Twain (1835-1910)