Set goals with at least one good friend. It should be someone you feel comfortable around, enjoy being with and trust. When you make goals with a friend, you can check in with one another about each other's progress. You can also work together on reaching your goals. If your goal is to lose weight, and so is your friend's, then you can exercise together. This will make it much more likely that you will actually work toward your goal, than if you tried to go it alone.
Draw a picture of yourself achieving your goal. Don't just see it in your mind's eye. Draw it on a piece of paper. If you can't draw, pull pictures from a magazine. Spend a good hour on it and throw yourself into it. The final result needs to be a picture you get really excited by. Place this picture somewhere you will see every day. The act of looking at this inspiring image will keep you focused and happily moving toward your goal.
Motivate yourself by attaching a really desirable reward to the completion of your goal. Sure the goal itself is the reward, but you need an added incentive for your good behavior. Many of your goals are likely to be ones that are good for you, such as losing weight or saving money. While these are noble goals, and important ones, they require a lot of self-sacrifice to achieve. By attaching a reward that is a little decadent, such as an expensive dress or a trip somewhere special, you give yourself an important extra drive.