I'm sorry to tell you, I'm not a native speaker of the french language but even I DO recognize many, many mistakes that aren't due to your computer not accepting accents (though it's hard to believe that you're from france and don't have a french keyboard!).
as vicky said, please look for a beta-reader. even if you think what you write is french, it isn't "français standard" at all!

Pardonne-moi, mais il me faut te dire que même moi qui a appris le français seulement à l'école il y a 7 ans, peut trouver beaucoup de fautes là-dedans, même celles qui sont grammaticales et pas là parce qu'il te manque des accents. (Tu viens de France mais n'as pas de clavier français??). S'il te plaît, comme Vicky a dit: Demande à un beta-reader de t'aider à améliorer ta grammaire. Ton français est terrible!

Yvi

Author's Response: My sister said she was going to fix it for me but to tell you something i'm not from france, my dad's side of the family were but not me...i live in canada.

euh... tu parles francais? ou alors tu cultive juste le style Yoda ? Write in your language dude, because that doesn't mean anything.

Author's Response: euh..DUDE! Le francais est ma langue marternelle! i go to a french school! maybe petetre c'est a cause MY COMPUTER DOESN'T ACCEPT DES excent! maybe you should learn french cause i do, i need to know! watch what you say before you trait!