In uni there are girls in my life that are awesome friends and then there's girls who make me slam my head on the table out of sexual frustration.

I'm extroverted but sometimes that makes me seem crazy and when I hold back I become too boring. I'm going to throw in some general scenarios and I need your help as to how to handle the situation:

  1. A girl in my class on the other side of the room, she keeps to herself and is there to study.
  2. She is sitting by herself, texting, out by the campus ground. I know nothing about her and can make zero observations except that she's pretty.
  3. We talk regularly during class/sport but afterwards she disappears.
  4. She seems older with priorities on her plate.

I can't believe I'm writing this to be honest. I just really want to fuck a girl instead of glaring at them as they walk past and I figured this place would have answers. How can I be myself with out coming across as crazy? How can I get her to hold a conversation with me?

EDIT: Thanks to all of you. If this ever works I will make an update.