To give you some imagination of how big the world is, please have a look at my depressing record below:

Blue is my home country and red (not grey!) are the countries I have visited so far... Of course, I went to some of these places more than ones, but on the other hand the red-coloured US or Canada look quite impressive and in reality I only saw one tiny city in Canada and a few places in the US!
You know that I really enjoy travelling, but even though I use every free minute to do so, I so far only visited 30 out of the approximately 250 countries worldwide. So I guess I have enough places left for my entire life-time :-)
Obviously, I am not aiming to color all these countries in red as fast as possible, but I prefer to really enjoy and discover each of them. Still, I must admit that I was surprised, too, by how little I saw so far.
