Gay-how to make someone that i had crush on knows how i really feel?

i really into this girl. i was almost everyday try to make eye contact with her(i said i was coz i dont do this anymore, got to concentrate on exam, and i feel frustrated coz she like dont care). i usually sit on front row in class, i was obviously always looking at her in class and i think my other classmates could see what im doing. they might had talk bout me too. but damn i dont care. i knew he had boyfriend but hes far away. theres always chance, and i want to grab mine. but, i cant tell straight girl like her that i like her.. straight to her face. no. she dont get it that im flirting with her. how stupid is that?. So how? i cant randomly ask her out.might freak out. and she always stick with her friend. What to do ? what to say? i dont want to end up acting weird everytime i saw her. What to do if i get chance to talk to her alone? what should i say?Gay-how to make someone that i had crush on knows how i really feel?
You should re-write this...I'm not being rude but I really don't understand it.