It may not always seem like it when you are out there on a long run by yourself, but running has been seeing a big surge in popularity over the last several years. 5K races are still by far the most popular race, but the half marathon is the fastest growing race distance. As a matter of fact the number of people that have raced a half has nearly doubled in the last decade.
Don’t get discouraged when you are out there alone, but also don’t feel like you have to be out there alone. Look for people to run with. Put a note up on this site or just start asking around. You may be surprised how many people will be willing to join your run.