Am I bisexual?

Until now, I’ve been quite sure that I was 100% straight. Lately however, I’ve been starting to wonder. I’ve found myself making out and messing around with the same sex, girls. At the beginning it was just something I did just to try it out, but now it has become something I’ve started to enjoy. When I talk to my friends, who are girls, about doing such things with the same sex, they get disgusted by the thought, while I’m totally cool about it. So far I have only had sexual experiences with the opposite sex, but I don’t find the thought of engaging in same sex intercourse any off-putting. Although I can see myself having sexual relations with girls, I don’t find it that easy to imagine myself in a romantic relationship with the same sex. Can I imagine myself having sexual relations with girls? Definitely. Can I imagine myself in a romantic and emotional relationship with a girl? Maybe. I know I get attracted to both boys and girls, but as I said the turning point is whether I’m able to be in a romantic and emotional relationship with a girl. So, would you define me as bisexual or not?