Retreat - Leave the situation temporarily until anxiety subsides.
Talk to another person - Redirect nervousness and conversation to someone you are not attracted to.
Move around - Force your body to move. This will get rid of excess energy that nervousness creates.
Perform a simple repetitive activity - Distract your attention by focusing on a task that requires simple, repetitive action (i.e. tapping your foot, squeezing a ball, chewing gum).
Do something that requires focused concentration - Focus all of your attention on a task that demands your full concentration (reading a book, multiplying numbers in your head).
Breathe Deeply - Take slow, deep breaths and exhale slowly. Repeat at least five times.
Repeat positive statements - When you catch negative statements creeping into your thoughts, quickly replace them with positive statements (i.e., Negative thought = “He/She probably doesn't think I'm pretty/handsome enough.” Positive statement = “If he/she didn't think I was nice looking, he/she wouldn't be looking my way.”).