The term HODL was not invented for nothing. Many non-HODL'ers or said otherwise, people that let their monkey brain rule instead of their neo cortex, lose. HODL-ers win as long as cryptocurrency markets continue to grow long term. It's called: vision.
I agree you bought at a price that you were totally fine with you should not sell that if it goes down you should be thinking that it's going to go up and you should be ready to hold until it is at a price that you are happy with. It is funny to me to read all the people upset now that they have to buy back in on bitcoin at its current rate way more than they sold at.