I have a crush on someone I met on the internet.
Really? Like a "falling-in-love" type of crush?
I think I fell in love with him just because he's so damn nice and friendly to me and many others on Facebook
Be very careful who you choose to potentially meet from the internet. There's a lot of scams and danger involved.
You're right. What do you think will happen if I tell him I'm too shy to meet him?
If he is a decent guy he will understand and you might be able to find out more about his character.  If you decide you want to meet, meet at a neutral location in public first but regardless of what you do, you always have to be very careful meeting people on the internet.