Confused with sexuality

*DISCLAIMER* Ok i am 19 years old, I live in a Christian house hold and have a bf . This is not intended to offend anyone or anything of that sort***

So obviously im straight and I know I am . Until I was watching a YouTube video and saw this girl with a rock punk look, piercings and short hair . I'm not gonna lie I liked her style and thought she looked cute. Like in a attractive way . But I think I was attracted to her cuz she looked like a dude and has a cool vibe. I didn't even make it five minutes in without switching the video cuz I was afraid that cute I thought those things I was considered to be bi . And I started to feel really bad about myself. Should I tell my bf how I feel? Is this a normal thing every girl goes through? I feel so stuck and don't know what to think 😥😣😧