Our lips are one of the most telling parts of our bodies because people are always looking at them. We talk through them, so people naturally alert their attention to them and to our faces in general. Because of this, any out-of-the-ordinary lip body language will be incredibly noticeable. For example, Science of People explains that pursed lips or consistent sucking of your lips typically means you're stressed out. If you find yourself in these positions, consider what could be stressing you out in your life.
Moreover, pouty lips, while commonly associated with sadness, may actually mean there's something you want to do, or some action you want to get into (via Ifioque.com). If you find your lips in a puckered state, this means you desire something or someone. If this is the case when your crush is around, it may be time to pursue them. Or, it may be an indicator that you like someone if you're around someone for whom you didn't realize you had feelings.
Lips can express intimidation and other not-as-pleasant feelings, too. As noted by Science of People, compressed lips often mean you're intimidated by someone, and a "repressed desire to speak" can be observed in flattened, squeezed-shut lips. If you find yourself in this position, try to uncover why you're not speaking and how you may want to break your silence.
So, which of these body language formations do you most identify with?