The only way I know to fix this is to create a copy of your tree as follows:
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Export a GEDCOM backup of your tree. [Download or export] button at lower left of tree view screen.
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Click on My Account at the upper right of screen.
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Click on the [Create or import new family] button.
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Click on the [Import GEDCOM or FamilyScript...] botton (lower left)
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Browse and open the GEDCOM backup you made. Click on [Import]
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Find you name in the drop down list to select yourself as the "me" person.
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Click on [Finish Import]
You should now have a copy of your tree with the corrected "me" and you can go to the My Account screen and delete the old version and rename the new tree as desired. Make sure you are happy with the new tree first.
Be aware the GEDCOM and or FamilyScript backup export does not save any pictures from your tree. If you have any you will need to re-upload them to the new tree.