PLZ HELP! confused about myself???

okay so, the thought of myself being, , bi completely disgusts and repulses me. im not a phobic, so don't get the rong impression. ive dated guys in the past.however the person, who i think i like, is my former math teacher from last year... everytime i see her, my face starts flushing and my heart skips a beat, and i don't no wat to say in front of her. itz rly wierd, b/c ive never felt this way to a GIRL before. whenever i ditch cl to study, i always go to her room and help her grade hw and stuff, and she always asks me to come visit her again. it seems as if she likes me as a student? i can never look her straight in the eye when im talking to her, and whenever we make eye contact, we both look away. also, i catch her sometimes staring at me from the corner of my eye. she also takes more interest in me than my friends whove had her b4, and they got a better grade than i did in her cl.