Edits can be reverted, even the most seasoned mappers make mistakes, so there is nothing to be ashamed of. Reporting the issue,if issue, if you can't fix yourself, is the right thing to do.
To be able to repair the damage we need the so called "changeset id" of the edits that need to be reverted. You can find the necessary information on the "History" tab in your OSM account.
In general as long as no further work has been done in the area, it is possible to undo any damage quite painlessly. The longer you wait the worse it may become. It is a good idea if reverting is (currently) outside of your technical abilities (for example you don't edit with JOSM), to either report the issue to the #osm IRC channel, or your local mailing list.
The error you made is, alas, fairly common, it is a really good idea to adhere to the rules collected here: http://wiki.openstreetmap.org/wiki/Good_practice
A further note, while we have permission to trace from Bing aerial imagery, please don't use the regular Bing maps for any input to OSM.