I will not mark all of the mistakes, so I'll just wrigth down the "fixed" variation of what you were trying to say:

My brother have connected my computer to the internet today. I am happy. I am having a seminar of mythology tomorrow, but I don't learn nothing because I'm a lazy person. (The sence of the following sentence is unknown to me, so I don't know how to translate it).

Also i woun't remember anything from what my boyfriend is trying to fix in my post because I'm a lazy person and I do not learn on my mistakes=)

P.S. AND WRITE DOWN THE RIGHT WORDS IN YOUR COPYBOOK! BECAUSE IF I'LL SEE THE WORD "becose" ONE MORE TIME I'LL GET MAD=)

Hey, relax, jonex.
It's good, that you want to teach your girlfriend, but may I say something?
I sure, you have to start with simple moments instead of what you have done, becose it's difficult.

Логичное замечание, с простого в любом случае легче начинать. Но я на английский забила в очередной раз...так с трудом вытягиваю университетскую программу. Может если появиться желание - летом подучу

То Джей: твой комент я до сих пор не прочитала)))

В двух словах, он пофиксил твои ошибки, причём правильно с его точки зрения, а также сказал юзать словарь и не бесить его словом "becose"))
А на желание нельзя опираться, я вот тоже хочу его выучить, но им не владею(