One can be lonely even amidst numerous people. They may be your friends, acquaintances and many more, but you still may feel like a loner. May be someone you want in the crowd is not present. Or even if someone is there you can still feel the same, because you’re in the crowd and can’t savor comfort. So you budge out of the crowd to feel at ease. But when out, and if the one you want alongside, is not there… you yet again feel like a loner.
P.S.: So try to adjust and rejoice in everyone’s company… (Easier said than done though…)