Fund Strategies for the Long Haul

I am 25 and have been investing in mutual funds in my Roth IRA. I own three funds: (BEQGX Quote)American Century Equity Growth, (SSMGX Quote)Sit Small Cap Growth and (LLSCX Quote)Longleaf Partners Small-Cap. I was thinking that this would represent a decent diversification strategy since there is a large-cap, mid-cap and small-cap representation; however, I am down 25%, 25% and 5%, respectively. I thought that these funds were all reasonable picks within their group, basing my picks on Morningstar rating, expense ratio, and past performance.

Should I be looking to sell these funds due to their poor performance and rotate into something else?

-- Shane Borden ...