Worrying is wasted time. Use the same energy for doing something about whatever worries you.
I’ve learned not to worry about what might come next.
Don't worry about being successful. Worry about being significant.
I'm one of those people who lives for the moment. If you concern yourself with what's going to happen a year from now, or five years from now, you defuse the moment. Whatever comes, comes. For this time I enjoy the ascent. I don't worry about anything except getting thinner thighs.