I wonder where thus the price of bitcoin came from. What do you think? Share your thoughts.
Are you familiar with the supply and demand? If this is not taught to you in your school then you should consider yourself to do some research. Google search is just one step away to you, if you can login and post here then why not ask google. I'm sure Google will give you bunch of ideas that you didn't know, so try researching and researching so you could gain some knowledge. 
Exactly, this is the factor that is responsible for a change in prices of things ,demand and supply is important to understand the way prices change. Then, when you also hold a product and "refuse " to sell, the effect is that, the product will be scarce, the price will go up. It is also how bitcoin interacts.