Like they mentioned, OP it's not a private key of Ethereum. I'm keeping my private key and I would say that the format isn't like that.
Next time if you are looking for help dont just post your private key anywhere.
Same suggestion OP, if you are asking for your private key don't ever give a hint on internet and just input your private keys. Never exposed it on the web for sure security or you will lose your fund.
Thus, there is no other way to retrieve your funds on that MEW if you can't remember it.