when you are older, your dreams become smaller.

As I a child of 7 years old, I wished that I would become president. As president, I could bring about peace and happiness for all people. As I grew older, I wanted to become a CEO of an multinational company and lead my company to be the most powerful company ever. When I was in high school, I hoped I would be a successful person: I could take care of my family and support them in any way they need. Time passed steadily until the day came that I realized how hard life is. Now I just want to have a good job and I am very scared of being jobless. People say : As you get older, your dreams get smaller. Today I went to tour les jour restaurant for an appointment. A friend of mine invited me to join a charity team. There would be a big charity campaign with variety of activities and we would have to orchestrate a lot of events and competitions. Because I had no experience putting events together, I thought that this could be real chance for me to learn something about that. Thus I decided to take part. My friend said that you would join a group of ten people, who would form a team. These were called the core teams of the campaign. I replied "Wow! That is amazing!", although I did not know yet how I could contribute. Then my friend introduce me to the others. I knew some of them from before. They asked me to introduce myself, and I did this obediently. then they asked me some questions, like "What do you want to do in the future?", "What are your favorite[?]?", "What do you specialize in?" bla..bla...bla... Oh my god, I couldn't think of any answers, but to save my face, I tried to say a lie [or simply: I lied. or maybe: I lied my way through it]... Then it was their turn, one by one.... They answered clearly and very specifically. I could not believe due to some foolish face like that [meaning unclear], all of them  have their own plan and they know what they want to and how to get it, I look back at myself... It was terrible... I felt so disappointed with myself...
I am living like a tree. No plan. No work hard. Everything around me is zero... how do I improve my situation?