Self-worth

When I'm just sitting around reading, hanging out at home or on a normal day in school, I feel that maybe I'm not too bad, and that I'm kinda worthwhile. But when I really interact--whether it's hearing what someone else did, or when I read blogs, I begin to feel that my life is so not worthy--as in when I see how well someone puts across a point, or at the good things they do for others, at the way people might be tackling their personal growth, at the wonderful social work so many people do, I feel that I am so not good enough. It takes a while of self-talk to be able to rationalize to myself that whatever my life, there are at least somethings I've done which are worthwhile and that it's not necessary to be the best in the field to be worthwhile. 'They also serve who only stand and wait' is a line that is always of comfort. It's from a poem by John Milton.
Here's the poem

On His Blindness

When I consider how my light is spent

Ere half my days in this dark world and wide,

And that one Talent which is death to hide

Lodged with me useless, though my soul more bent

To serve therewith my Maker, and present

My true account, lest He returning chide,

"Doth God exact day-labour, light denied?"

I fondly ask. But Patience, to prevent

That murmur, soon replies, "God doth not need

Either man's work or his own gifts. Who best

Bear his mild yoke, they serve him best. His state

Is kingly: thousands at his bidding speed,

And post o'er land and ocean without rest;

They also serve who only stand and wait."