If you are leading others and you're lonely, then you're not doing it right. Think about it. If you're all alone, that means nobody is following you. And if nobody is following you, you're not really leading!
Think back to the most important experiences of your life, the highest highs, the greatest victories, the most daunting obstacles overcome. How many happened to you alone? I bet there are very few. When you understand that being connected to others is one of life's greatest joys, you realize that life's best comes when you initiate and invest in solid relationships.
I am convinced more than ever that good communication and leadership are all about connecting. If you can connect with others at every level -one-on-one, in groups, and with an audience-your relationships are stronger, your sense of community improves, your ability to create teamwork increases, your influence increases, and your productivity skyrockets.