I know this has happened to some people
They wanted to post their address into some block explorer but copy paste still had a private key
Another day they log in and poof all the btc is gone

stay safe my friends!!
Did this happen to you? My goodness! If this happened to you, I hope the wallet you are using is only having some small amount of Bitcoin. Because if the amount is somewhere around 5 BTC, then mistakes sometimes really pay a high price.
Take very extra careful next time.
This can happen to everyone but still there are clear difference between private keys and address and you don't and needn't play with your private keys unless you are trying to write it in a paper.