I've made a few grammar mistakes1 in my sentence.

I've made a few mistakes in my sentence.
just Right now there is someone who can help me with correcting my grammar mistakes.
That's so nice of you. I felt feel2 so excited to be here, because with your help I can improve my English writing skills and get rid of my Chinglish, which is quiet joy would make me really happy.3
besides Furthermore, I am very really appreciate your behavior help.

1) Don't forget that "few" = plural, so you need an "s" on the end of the noun ("mistakes").

2) "Felt" = past tense, and hopefully you still feel excited to be here, so I changed it to "feel" (present tense). :)

3) I'm not sure exactly what you wanted to say here, so let me know if I misunderstood.  

Great job!