I'm a college student. I go to parties, I drink, I talk to a lot of girls, etc. I'm surrounded by people hooking up all around me, yet I never manage to do it myself. Frankly, I think its because I have no freaking clue how to judge if a girl is interested in me or not, and I'm not about to lean in for a kiss without having some sort of indication. What are some signs or signals I should keep an eye out for?