what's happening to me?

I am 17 years old female and have been mastrbating for years now... and I have watched for about 3 of them. Previously I would only watch straight porn and didn't find it very stimulating to watch or read gay erotica(man man). However very recently have I started reading gay erotica and porn and I find it turns me on more then straight stuff and I'm feeling rather confused about everything. Has anyone been through something like this or could help with advise? Anything?