As to the fulness issue you mentioned, I was born and raised RC in the Dominican traditions through HS. Gotta tell you that I never had any relationship with the Lord no matter how many masses, novenas, sacraments I was a part of. It never really caught up with me until my early thirties, after I was married with 3 kids and a successful career. It wasn't until I came to grips with life's basic questions that I realized that I really could know Jesus like the apostles did. I wanted that. That's when I finally got serious with God. My whole life changed when I finally asked Jesus to come into my life, sit on my heart's throne and make Himself real to me. WOW!!!! That was 19 years ago. It was a life-changing experience :)
However, I stayed in the Catholic Church and have found the fullness and richness of the faith that I never knew growing up. It may have been bad Catechisis, or the fact that I was never made to go to Church and had no one in my life who was religious, or whatever, but I did make a conscious decision to go back to Church and I have felt more complete now than I did in the first 30 years of my life.
When I went to confession for the first time since my First Holy Communion, I felt like the weight of the world had been lifted off my shoulders, and Jesus was truly with me, at that moment. It was an awesome experience.