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And no, from the sounds of it, it is a YOU-problem, not a STEAM-problem.
Chances are you are still confusing things.
When you create your account, you choose a login name. That login name is not visible to anyone other than yourself, and it's what you use for login. If you click the menu in the upper right, you'll see an entry "Log out of account ... " -- that's where you can see your login name. Likewise, going to account details will also show your login name.
Your profile name is the one that users see. You can change whenever you want, and it has no meaning to Steam; it's ONLY used as a name that's shown to other users.
https://support.steampowered.com/kb_article.php?ref=5421-QTFB-3090
https://help.steampowered.com/en/wizard/HelpWithLoginInfo?issueid=406
Last option:
https://steamcommunity.com/sharedfiles/filedetails/?id=1126288560