Lilycurly, your story mirrors mine. I was 18 as well. Even back then I still didn't really know what JW's really truly believed. I was terrified to go through the questions, terrified that they would discover how ignorant of my so called beliefs I was. I was so relieved to find out all I really had to do was quote from the scriptures listed in the book. I only prayed about my dedication because I thought that's what I should do, but I really had no clue.
And the bathing suit was another thing! We were at a CA, and we had to walk along a red carpet through the crowd to the pool! Every body turned out to watch the baptisms there, and of course, because it was the two of us (my brother), all my family came out, even non JW's!