How I know that you are sad? If you are looking for inspiration or happiness online, you are sad. Now, there are many things on the internet that can help you. Advices, rules, changes, and many others. But the real key is in you. In order to make the space for happiness, you must eliminate sadness.
When a person is sad, he/she cannot think straight, and this is the biggest problem. This means that your feelings, emotions and personality react differently. A second mistake is when you try to force them to work normally. Simply said, this is impossible. You need time in order to heal and recover them.
The best thing you can do is to go to some place where you can be alone. I know, many therapists will say that you must be with people and your friends, and they are right. But you must talk to yourself. So you need privacy. Go to your room and think about what you did, what is the reason of your sadness? Think about this 10 minutes. When you are done, start smiling, because you just gain a new mission in your life. That mission or missions, should make you move forward, toward your dreams.
Motivation can come from success and happiness, but it can also come from failure and sadness. An interesting fact is, those motivations that are born during some failure are much stronger than ordinary motivations. Also, they last much longer. For you, the only thing important is to be happy. Use those motivations and everything rest you can find. After all, personal goal is the biggest goal.