What makes us jump into new adventures?

I recently discovered a part of me that loves adventure, that feels joyful when I explore new things or experience new opportunities....and yet for a great part of my life I felt anxious and nervous any time I thought of venturing into exploring the unknown. I created a circle of safetiness that didn't allow me to travel too far alone or do things on my own, such as; going to the movies or going to a restaurant or traveling -- whatever action I took was mainly with family and friends. I had to feel safe.

I admire all of those people that go off to search, explore and experience without any fears or any anxieties, instead they leap into the adventure with joy.