You screwed up or not depends on what course Bitcoin was purchased.Now many can say that they screwed up when they sold bitcoin across price $ 1000 and $ 2000.Throughout 2018, everyone said that the price would be more expensive, but  one listened and sold. Now many are disappointed. You are to blame for this).But I have good news for You.The price will be even more expensive within 1 year.So keep bitcoin in your wallet as long as possible.