How do you deal with such things in positive way?
You have to make up your mind if you are a trader; once you take profit or sell at loss; no looking back, no regretting; you take your lessons and move on to the next investment project on your schedule. Also, in as much as you sell in profits; then you should have no regrets, the joy in trading or investment is to take profits.
At the end of the day bitcoin is a long term store of value asset and it will always go up, which means if we end up selling, we are going to see it go up, because in the long term it always goes up so it doesn't matter if it goes down or up during the first days or weeks of us selling, eventually after few years it is going to be so much more and that is the real deal here as well, we are talking about something we can't control.