Need your help correcting some errors!

Hello my teachers!
I've wrote a letter to my professor!
I guess there are some mistakes to be corrected!
Give me some advice!
Thanks in advance^^

Hello prof. Lee.

I'm jiyeon Suh taking your CLT class.

I've tried to send my presentation file several times but it continually failed to do it.

Now I attach Zip file for the presentation file which has less capacity that of original one.

I hope this won't make you irritated.

All the time when I'm in your class, I have butter flies on my stomach.

I will challenge myself taking your class this semester.

Since I know, however, that it's all good for me, even my English Ability is not enough to deal with,

I will try hard.

Thank you for teaching us!

With regards

Jiyeon Suh