I always walk up behind her and open my mouth to say something, but nothing comes out and I walk a different direction. She seems pretty quiet because she is always be herself. How can I start a conversation? I would say something like, "hey ur in my astronomy class right? Did you understand ______" but the class is fairly easy and I think she might think im an idiot for not understanding something clearly stated. Plus when I get near her my mind goes completely blank and I cant work up the courage to run up and say hi. Freshman in college