I don't know if I am cursed or something. If I sell a coin now from airdrop/bounty few days later that coins increases much that you will regret selling. If I hold a coin from airdrop/bounty again that coins price decreases much that you will regret not selling right away. I'm confused now whenever I sell the price increases and when I hold the price decreases. Am I cursed?

I laughed at your words, because it turned out that our fate was almost the same, I became traumatized if I was going to make a sale because I was afraid the price would increase, whereas if I kept holding it I was worried the price would get worse.
the solution that I always do is, if I decide to sell it, then I do not want to hear the development of the price of coins that I have sold, so I do not regret knowing that the coin has increased in price.