Don't worry you are not lonely when it comes to disappointing yourself in trading. I also experience it before and it much harder because i thought this crypto is not for a long run. I had bought several altcoins before and i do it just for fun then when i see the price falls down i suddenly sell all just to exit. After a couple of months, i saw more than of altcoins that i invest in the past grows in it's price. That's very frustrating and i had a hard time sleeping in the past and that's why i continue now investing now thinking it will happen again.