My friends think I'm cool for some reason. I'm like Hell no! I'm not cool. Who cares what people think of you. No one will accept you for who you are. People will always judge. Even when you change something about you, people will still judge. Just be yourself. If you're weird. Be weird. If you think you're pretty, then you are pretty. If you're nice. Be nice. It's easy. You shouldn't have to seek another's attention or get someone to like you.
To be able to look cool in front of other people, you imply need to be yourself. You can do this by having a positive attitude and relax whenever you are around people. You can also do this through the way you dress as well as how you talk. You can get more tips at http://www.wikihow.com/Be-Cool.