If your strategy is good, then it's your (inner-child-) brain, which didn't learn yet, that losing money is not the end of the world, if it's part of a bigger picture.
Even if you know that, your brain dosn't change attitude so quickly.
Had the same problem at my beginning, was really shocked to discover my brain dosn't understand what trading is about.
Keep telling yourself (in the bathroom, on the bus, on the highway):
"I can afford to lose money. I'm trading for long term success. Stop loss hit is totally okay"
(your SL should be 2%, or any other amount you really willing to lose for the sake of long term success)
Whishing you success