Your loss is chump change so far... (no offense) Don't fret. It will go up eventually. :-)
You should measure loss like WEB does... opportunity loss is much greater. We are fortunate that we can only live one life. If we could 'test run' other paths in life, and see the results, mass suicides would probably be common place....
It's easy to say, "I shouldn't have stabbed that guy over $50 bucks" after you find yourself in jail. But have you ever asked yourself "I should have pursued an MBA when I was 25". or "I should have quit xxx company 5 years ago". Maybe if you picked the 'correct' paths, you'd be managing director on Wall Street, cashing in million dollar checks. Would you be worring about 4 shares of BrkB now? But remember, money is not everything. You (we) should all be worried about missing opportunities in life, which unfortunately finances plays a big part!
Good thing we don't know what the 'correct' path is... :-)