Oil Dropping to $110

Well, I feel real stupid now. Considering I had that short on crude oil at 115.5 a week ago, I could've made a lot of money (like 20k if I held to today). Last week I never heard so much media coverage on Oil, which to me marked a peak in Oil prices. I however put on a short position a couple days too soon that was too large for my account (short 4 contracts), and I exited as soon as I could for a small profit after having taking a lot of pain in holding the position for 4 days. I stopped trading Crude because I got scared. I got scared because I put on too large of a position. Risk management is my biggest barrier to success that I need to work on.