You feel dumb after setting your dumb goal.

It's totally natural to feel that way because you've never set a dumb goal. This is the very first time you get into unknown voluntarily. People don't do this and that's why you feel yourself dumb. But you are not fool. You are smart enough to understand how to grow. The only way to grow is to get into unknown even if it is scary. You want to do it anyway because you now recognize what really matters to you in life.

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We have been trained to follow someone else since we are born. Your parents, teachers, bosses. You don't know much yet, so following someone who knows better seems to be a good strategy. But, following someone is the beginning of tragedy. You need to follow your heart instead. 

"Follow your heart!" What does it really mean? How can I follow my heart? If you have set a dumb goal and you feel dumb, it's a good start. That's when you follow your heart. You feel like someone has taken over you and you become just a servant of that someone. Later on, you may find that that someone is actually you.