A Proper Analysis

What is loneliness, really? After so much philosophy I would say it's simply anguish over a lack of human contact in the future. Do I know myself to be charming, or at least acceptable enough to have friends in my later life? I believe so. But let me not analyze it from this context; I fear it is a little too trite.

The effect of loneliness on me: A lack of drive. A lack of accomplishment (is all accomplishment measured out in others' coffee spoons?). Truly, it is a quest each day from rise to retire to convince myself that what I'm doing actually matters to me. I'm certain I like what I do, but that does not answer the question.

What does it mean to matter? What is importance? Are these questions simply too difficult to answer fully? I can provide examples and counterexamples, but no precise definitions that would make deduction easier. I need them. I need philosophy.