No, it's fine, to me atleast. Everyone goes through that and sometimes it lasts forever. For some it can be a turnoff, but you're most likely very young and it's just a tough time for you. Stay strong!
My definition of bisexuality is having attraction to both genders sexually. Are you sexually attracted to her? This has happened to me before, but I knew I wasn't, when I realized I didn't want to do anything with her. Maybe she just made you feel good one day, at times that will happen and you...