It could be a phase. I went through a phase where I dated mostly girls in high school, but realized that what I'm looking for in a relationship can only be found with a guy.

But I felt real love, this wasn't experimenting, it was serious self-discovery.

You can only discover it for yourself. Yes, Christians believe in marriage between a man and a woman, but there are also plenty of Christians who support gay marriage and there are also such things as gay Christians.