How to Delete Your Steam Account Forever
Yes, you can delete your Steam account. If you think that you will not return to play the games on your Steam account and you’d like your account information removed, you can request that Steam Support delete your account. Steam Support will ask that you provide comprehensive Proof of Ownership prior to fulfilling the request. Account deletion is permanent. You can delete your Steam account right from your browser by going to your account settings. Deleting your Steam account will make almost every Steam game unplayable. You’ll also lose any money in your Steam Wallet, along with all of the information on your profile.