My husband and I went to ours. We hadn't been in about six years so it was a bit of a shock when we showed up...in jeans and t-shirts. We refused to stand for the song or prayer. We just sat through the hideous school and after they announced us, we stood up, grinned and walked out. They talked about it for weeks.
Totally different situation for you though. I agree with those who said YOU make the decision. Don't let your father make that decision for you. You are an adult.
Rachel