Inner cheer is destroyed by a conscience which bites. Learn to do everything in a worthwhile way. It's an art which teaches you to appreciate your inner beauty (It makes you think twice about ruining it, too)
Don't be hard on yourself when making a mistake. It's much more effective to be handled with love. Telling the self off is a terrible habit, it subtly shapes a nature of sorrow.
Finish the business of thinking of rubbish and instead take delight in all that you've found.