As someone who has been down this road a few times, the good news is that there is light at the end of the tunnel. Although it may sound like a cliche, the fact is that adversity that often creates loneliness and self doubts - also builds character and confidence. In my case it forced me to go far beyond my comfort zone as a entrepreneur and as a result I ended up learning lot more and achieving lot more than I ever though possible. So when you feel lonely go learn a new sport, join a online course, attend a conference, do some social networking, and post a few question on Clarity. You will find many friends here. Good Luck!