I’m straight but am I?

Okay so I definitely label myself as straight because I’m sexually and emotionally attracted to guys. However, when I see a beautiful girl I’m like, “wow she’s sooo pretty” and/or if I see a masculine girl (dress like a tomboy?) I think she’s handsome/hot. But I’m not sexually attracted to a girl... for instance I don’t read or watch GL, and I can’t imagine myself doing anything with a girl. Another thing is that when I see a girl cosplayer cosplaying as a male character, I drool over them. And I remember someone commenting on it’s post saying “if you think she’s hot, you’re bisexual”. Sooo that made me think, ‘am I bi curious? Or am I just appreciating their aesthetic and the way they look.?’ Like what would define someone as bisexual. Do I have to be sexually attracted to both genders to be considered bi sexual? And I know, I don’t need to ‘label’ myself with either or. But I’m just confused oml