Make a summary of what your big dream life looks like. Describe what you do, what your purpose is, what it feels like to live this life and which person you admire the most.
What would you do / what is your passion: …
What is your purpose: …
What does this life feel like: …
Who do you want to be like (in your field): …
Now realize that this is actually possible, how big your dream may be! You just need to work and learn hard.