Feeling lonely at times is very human. Loneliness is an emotional state in which a person experiences a powerful feeling of emptiness and isolation. Loneliness is more than just the feeling of wanting company or wanting to do something with another person.
Solitude
Solitude is the state of being alone and secluded from other people and often implies having made a conscious or subconscious choice to be alone. Everyone including myself has times when we are alone through circumstances or choice. For me I would say its circumstances and not a choice.
A switch in this career has made me realise who are my best friends.. and grateful to those who has not outcast me.