Yes. Do NOT get out now. Selling now is only locking in the loss. It's not a loss until you sell.
You gotta take the word loss out of your vocabulary. Use devalue instead.
My suggestion to you is to write out a simple short and long term investment plan explaining your goals like retirement. It only needs to be 4 to 6 sentences. "I want to retire in X years. To fund my retirement I will invest in Y. My strategy will be to buy and hold. Etc."
Once you have a plan, it doesn't matter how you feel today or six months from now; if it doesn't fit the plan then you don't act on it. Simple as that.
Alternatively, if you're nervous then hire a financial advisor to talk you down from the ledge.
Never get out on a down market. I waited too long in 2008. Learned my lesson.