WILL YOU JUST PLEASE KILL ME NOW?

There is the SUUUPER annoying girl at my school who just wont leave me alone!! She follows me around and she is in my homeroom! and when she wants you to pay attention to her, she taps your arm or just randomly bumps into you, or sighs so you will look at her!! She is one of the shyest ppl in my grade tho and i cant just go up to her and be like "leave me alone i never wanna see u again" (which is what i want to say) its going to be like this for the rest of the year i and i really need help! PLEASE! IM DYING!! ~thx