How to be Smarter: You look silly if you're wrong. You look like a fool if you don't admit it. One "I'm sorry! So glad you are here to show me" corrects the problem and makes the other person feel good. If it turns out you were right in the end, you'll look like the smartest guy in the world. If it turns out you were wrong, NBD.
How to be Prettier: http://shopapparel.lacoste.com/p/Solid-Pique-Headband/B0011UUJYA. Something from Lacoste that costs seven dollars? Yes please.
How to be (less) Awkward: Recipe for being well-liked by your peer group: just be fun. Smile, laugh, buy someone a drink, ask how they are, send a birthday text even if you are not close. Easy peasy.