I got into the bitcoin again last year after losing all my 4.5 bitcoins to ponzi schemes early last year. I bought in bitcoin again at $20k. Now bitcoin is $6k+. I'm regretting my actions. 
Well, it's all part of the investment of cryptocurrencies to lose value in a very quick time and you're supposed to expect a drastic decrease in price especially with this kind of volatility for an unregulated kind of currency. There's no shame with what you're feeling now since the decline was unexpected.