A Most Awkward Goodbye Letter

Last year, when I first started teaching ESL, I was operating under a grant that allowed students to continue attending the same class for several semesters. Here in the 2013-2014 fiscal year, I'm working under a different grant, one that is fairly number-heavy. So, for the first time, I'm only allowing students to stay in class for one semester, so I can teach new students and serve as many as I am required to serve.

Yesterday was the last day of my last class of the semester. I gave the students their certificates and awards, we had a big party with lots of food, and the students showered me with Christmas presents and love. All except one woman. She, maybe 65 years old and a returning student who has spent 8 months in my class, surreptitiously slid a note on my desk while I wasn't looking, only to come up to me after class and say, "Read my note!"

When I came back to the office, I unpacked my things and opened it, written in pencil on a sheet of lined paper torn from a notebook. Her orthography is not perfect, but here it is, written just as she wrote it. The most awkward goodbye letter I've ever received from a student.

"La Parodia de los Estudiantes"

A donde iran, tristes y fatigados, los estudiantes, que de aqui se van. O si en el cielo se veran angustiadas. Cuando Dios nos llame y no poder entender. A la mejor Dios habla ingles? Unas nos veremos angustiadas, por no poder entender.  Otras fatigadas por el esfuerzo que hisimos y no pudimos aprender. Estos estuduiantes que de aqui se van. Triztes por no aprender. Se va la maestra no la volveremos a ver.
Gracias por todo el esfuerzo que hizo para que pudieramos hablar ingles. Nos vamos triztes y con muchas ganas de volver. Para unas el esfuerzo no fue en vano. Para otras fue dificil entender pero nos llevamos el esfuerzo que hicimos para poder entender.
Adios maestra adios.
Bendiciones."

Translation:

The Parody of the Students

Where will they go, sad and fatigued, the students, who leave this place? Will they be anguished in Heaven? When God calls us and we won't understand. Could it be that God speaks English? Some of us will go anguished for not being able to understand. Others exhausted by the effort we made but couldn't learn. These students leave from here. Sad that they can't learn. The teacher is leaving we won't see her again. Thank you for the effort you made so we could learn English. We are leaving sad and anxious to come back. For some, the effort was not in vain. For others, it was difficult to learn but we take with us the effort we made to try to understand.
Goodbye teacher goodbye.
Blessings.

Am I really that terrible of a teacher? Do my students really have such a low opinion of themselves? I do understand that many of the intermediate students feel badly because their test scores didn't go up as high as the lower students did (mostly because it's easy to make a level gain from Beginning to Intermediate, but hard to take that step from Intermediate to Advanced), but they shouldn't be so worried. Also, I don't like feeling like I've failed them.

I have a stack of presents and hugs from the other students, but this one letter is the one that worries me.

Hopefully next semester I won't disappoint them!