That's normal. Anybody who has any amount of bitcoin fees like that when they see a big drop, more so when price goes below a certain strong resistance such as $20k, even more so when the drop is illogical (like a panic sale).
But if you think the psychological pressure is too much it may be because you have invested more than you can afford to lose and you may want to make some changes in an appropriate time.
Right and the point is that we all are under pressure when we see our investment going down with all the negativity surrounding the market with all the red candles but you need to control your emotional play at that time if you have invested in bitcoin for long term.Then you feel relieved be as you are not into selling at that time but on the contrary if you find it as investment opportunities to get them at discounted rates you will be doing the same.
The main profit/loss will occur only at the time of selling of your coins because if your investment has gone down or up with the current market prices it's unrealised gain or loss but if you can manage to hold it for long term and prices boost up your automatically comes into profitable situation.But as you said the main problem with people is they sell under pressure and panic in the market giving them loss.The main reasons for it are :
1) They expected bitcoin to be short way of becoming rich fast but when this does not happen or they see little correction in prices they start panicking and sell off at loss also to get out of market with FUD and loss in their hands.
2) Investment of more they can afford to loose which builds up more psychological pressure and you think it's better to take out the remaining balance before it goes to zero
3) Investment based on someone's else influence without even researching about bitcoin and they make fool out of people so they need to make their own decisions.
But as said if you are long term holder then check out the returns for bitcoin for over 4-5 years you will find profits only.