Sometimes it can hit hard, but in loneliness, like in everything else, there is opportunity and positiveness. In loneliness one has time to think what one really want's, and plan how to make it happen. Loneliness doesn't end by sitting home, there's a world out there, full of bossibilities, hobbies groups, bublic gathering place etc.
And ofc in comparison to loving and caring relationships it may seem like a horrible fate, but it's not. It's freedom, and one has to use it, or it will go in vain. I don't compare my current situations to the ones I wanna be in. I just find out what I want, and start going towards it, compairing is just useless wallowing. And it's not what you have now, but what you do. That is the key to happiness.