I try to keep myself fully occupied, but I still get this feeling of loneliness.
How does one prevent loneliness?

Look in the mirrow, smile for yourself and say "hi! m goin out to get me a life!"
Lool I know but it works for me. Its kind of theraputic.
And then looking good helps. So, do your hair, put on some make up, dress in smthn nice AND THEN just go out and.. maybe hang with friends.

Keeping busy keeps one alone.

Where is the social interactions when someone is busy?

Work can't be the only life we have,it's called work for a reason.

Socialize,find a cause to support,get involved in something that requires effort,other than a job/work,etc.

Seek others with similar interests and try for interaction with them, some find it in here,others require more in the real world, or in between... for balance.