Don't buy new things until you have used everything you've got, unless there is a reason to stock up, such as extra food for an emergency. This means, if you have 10 books on your bookshelf that you haven't read and made the most of yet, don't go out and buy another book!
Don't desire things that are available to you. Make the most of the things that you are.
Instead of complaining about things that you don't like/should be fixed, come up with a list of problems and how they can be fixed instead of whining about them.
Base meals around vegetables.
Make decisions based on the long term, not on short term pleasure.
Weight things out from every angle before making decisions such as whether to eat a chocolate bar, whether to sleep in, whether to start dating or whether to get a pet. If you can think of a reason to say no, you probably shouldn't!
Don't pin anything new on pinterest until you have sorted out your current pins. Don't pin something in the future until you have investigated it properly.
Dream big, live small.
Take advantage of the opportunities that are available to you instead of trying to do big, expensive things that are near impossible.
Don't blame anyone for bad things in your life, treat it as a learning experience, see how you can become a better person and were you were at fault. We can't control others, or circumstances but we can control ourselves.