Beggining

My name is Max. I'm 18 years old and I have no fucking idea what to do with myself. I'm in the last year of high school number 8 in Poznan. They say it its one of the best in my town but what does it change? I have math, geo and english on extended level. Yeah... The subjects of a guy "I have no idea what i want to do after exams". I like traveling but I have been only in few places yet like Wales, London, Italy, Prague and Austria. I don't know life at all. How can I choose a collage and my future profession without any knowledge about the world we in?  I was always wondering why people want to explore space when they haven't explored mother earth yet?