Is it normal to be attracted to a girl

I am a girl and have had multiple boyfriends over the years. I am attracted to these guys and have good relationships with them but I am also attracted to girls. I have only dated guys so far. Many girls can talk about whether another girl is attractive or not but I have kissed a girl and enjoyed it and would think about going further. I have even fantasized about a threesome (2 girls and guy). Is this normal? Does this mean I am bi? Please leave helpful comments without getting to religous or offensive thanks(: