Yeah, being nervous all the time is not a good trait in investment. Be confident on the coin you have investment, a loss is normal so expect to receive some and learn from it.
comfortable is good but should also have a realistic and flexible mind not just comfortable. being too comfortable sometimes makes you lose money.
In crypto currencies, to get profits in crypto market requires you a lot of risks and sometimes you must accept the loss. You should be more patient and keep calm because as far as you know cryptocurrencies is notoriously volatile, it can go up and down and even stable immediately, we dont foresee or predict accurately about it. Therefore you should think in positive way, when you feel comfortable and keep you in good mood, you can do everything well.