Select the (text) frame and go to Window > Wrap and click on the none-button.
But you should work with Object Styles and make sure that your default styles have no text wrap upon them. Default styles are those with one of the two small icons on the right.
To avoid text wrap for a single text frame go to Object > Text Frame Options (or in the context menu or cmd/ctrl+B) and activate to ignore text wrap. Save this also in the Object Styles.
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This is a simple one to do it. Start up your Indesign but do not open any document or new document, just click on the text box in the toolbar and press Ctrl+Alt+W (Text wrap), a text wrap dialog box will appear on that set to none (no text wrap). Now open up a new document and see is it disable or not.
whenever I create a new text box
I'm not clear from the wording if this is happening in one file, or all new files. Clearly text wrap was turned on as a default, but it could be in one file (a document default) or for all new files (a system default).
This article should clarify the two, and give you the skills to disable one or both.
Once you understand the difference, you can disable it correctly with Window > Text Wrap and clicking the first button on the top row.