I am sure that we all have experienced the feeling of loneliness at one time or another. The definition is stated as being isolated ,empty, abandoned, solitary, companionless. I am sure that there are many more words that can be used to explain loneliness.
One can be in a room full of people and feel alone because they are not connecting with others or their emotions. So they might find it hard to communicate how they feel or what they want. Loneliness is a state of mind that you have tuned your thoughts to.
Sometimes the person who tries to keep everyone happy is the most lonely person. Their life might be in a constant battle between wanting to be alone but not wanting to be lonely.
You will never be lonely if you learn to befriend yourself. Change your mind set. You are your best friend so rely and depend on yourself to make yourself happy and fulfilled. At some point, you have to realize that some people can stay in your heart but not in your life.
Loneliness is designed to help you discover who you are, and to stop looking outside yourself for your worth. Sometimes you have to stand alone, just to make sure you still can.
"Loneliness is the poverty of self; solitude is the richness of self" author May Sarton