(asked by Jeanine G. from Oklahoma)
If I understand right, you want to know if people in France will make fun of your accent or not?
You can stop stressing now; most French people can’t distinguish between the various American accents. Can you distinguish between the various French accents (or German or Italian or else)?
To answer with more details, when they hear a foreigner speak their own language, most French people are able to distinguish between English and another language, at least in areas that are heavily in contact with foreign (and English speaking) tourists. In other parts of France, some people won’t know whether you speak English or Dutch or German or whatnot. It’ll really depend on the people and the regions.
Now, if you narrow down to French people that can speak English, most of them will be able to differentiate an American from a British accent (and an Australian one if you’re lucky), but that’ll be pretty much it.
To find French people that can distinguish between various American accents, you’ll need to find French people who have lived for an extended period of time in the US, and even I am unable to recognize many American accents.
And seriously, when dealing with such people, they won’t judge you because of your (regional) accent.
Finally, as you mention the Valley Girl accent, if you have such an accent or anything that’s more or less similar and sounds bratty, or annoying or anything else along those lines, whether people can recognize where your accent’s from will be the least of your worries (it won’t even matter whether they understand English or not), you’ll be perceived as an annoying stupid brat, so you’d better start working on your elocution now.