Has anybody moved to a foreign country where you dont know anybody?

does not necessarily have to be another country it can be a state but perferably a country can you tell me about your experience how did it go how did you feel not having family where you moved. Cause i really want to move to Bogota im 20 years old Colombian born and the only person i have over there is a half sister i go to Colombia all the time i know vacation and living their is totally different i just don't want to move and regret it any experience advice would help thanks in advance