Confused about my sexuality?

First of all, I feel really dumb even saying any of this. I am twenty years old. I was raised in a house that supported gays, I even started going to gay pride parades every year when I was 17. When I was 14 or 15, I introduced myself into porn, and I found I was more interested in girlongirl action rather than straight porn. I didn't really pay attention to this though. I have a boyfriend of five months, too. My entire life, I thought I was straight, until a month or two ago I developed a..celebrity crush? On Selena Gomez. Now I get butterflies whenever I think about her or see her, and I don't know if that's normal for a straight girl to have celebrity crushes on girls or.. I don't know! I'm just really confused. Help?