I suppose the worst feeling of loneliness is when you are in relationship /marriage/friendship ,yet you feel utterly lonely,and unable to even share ,not to disclose to people how inappropriate your feelings are and not to deprecate your partner
. Put on a smile,tell yourself "I am fine and all is good" ,put on your favorite music and try not to think of loneliness .I try to imagine myself in a different situation ,where I am someone worthy and loved,connected emotionally...sometimes it works
Give it a try
Sorry you feel that way
Hope you'll be happier soon