You just have to decide if you're a Tigger or an Eeyore.
Look for the best in everybody
Be good at something. It makes you valuable.
You can always change you plan, but only if you have one.
Throughout my academic career, I'd given some pretty good talks. But being considered the best speaker in the computer science department is like being known as the tallest of the Seven Dwarfs.
Call home at least once a week. It's a proven fact that we call home less the older we get. And that's wrong. It should be the other way around. As we get older, our parents get older.