Have you ever questioned your sexuality?

So I like boys and I am a girl. But sometimes I'll catch myself looking at girls and thinking they're cute, but I don't know if this is normal or if I'm bisexual? I've had boyfriends but sometimes I'll see a girl in a bikini or something and think oh she's hot. I know that sounds bad, because I've been brought up to believe that that's not okay. But I'm kinda wondering if I'm bi