discovering sexuality

I'm 18 and have been kind of exploring my sexuality lately by watching porn to see what turns me on.. I have had sex before but I'm currently single so I'm using this as a time to get to know my own body and my likes and dislikes.. I have discovered that I get turned on by the women in porn. It confused me when I first realized that it was the women in the videos that I like watching because I've only ever had sexual feelings for guys before. I have always noticed when girls are pretty and sexy of course but I kind of thought that it was just because I was jealous of the way they looked (I've always struggled with my confidence). Does getting turned on by the women mean that I'm bisexual? What are some of the ways that y'all realized that you were attracted to women?