Do you only consider the pretty girls you've kissed, or do you factor in the others... and don't say that you've never kissed anything other than a pretty girl.
Assuming that you're being upfront about your trades, you're considering only the closed trades, but a total portfolio should factor all holdings. After all, can you imagine a portfolio manager telling his investors, "Don't consider the open trades! They're not ready yet."
If we do consider the open trades as well, your total portfolio would then show a return of 12.12%, a bit off your 15%+ boastings. But not much off. Why not brag about that figure instead? Have to count in your triceps as well as your biceps, you know.
Looking more closely, considering your total of 37 trades over the term of the portfolio, from 1/02 to 7/03, or 17 months, makes for an average of 2 trades per month, making your earning rate an average of 0.71% per month, or about 8.5% return per year.
Looking at just this year's performance of your portfolio: You have 27 trades (16 closed, 11 open) and a total return year-to-date of 10.65%
The Vanguard 500 Index Fund has a year to date return of 15.16%. Over 42% better than yours. They are huge, of course.
In fact, there are hundreds, thousands, of regular ol' mutual funds outperforming you:
http://screen.yahoo.com/a?trytd=160/&b=681&s=trytd&db=funds&vw=1
You could just give them your funds, relax and go take a dive in your pool. What exactly is the mr.market advantage?