Good work! Focus on breaking up your sentences with periods. You've got a lot of sentences with commas and they become long and hard to understand.

Good Job

I'm actually working in a center teaching IT to old people. I have go twice a week for a couple of hours each time and I really enjoy it. (or do you stay 2 hours total for the week?) Every day is different with them, they are people who really want to learn a lot of different things (not only about IT) and they are really determined to reach their goals.

For the most part, they are grateful and that motivates me. I have to confess that some days I feel a bit stressed-out (be careful: stressful means that you are causing stress to others!) working with them because they are very impatient. too, even though, But I have realized that I love teaching above all things and that makes me feel better.

I think that I set my heart on my explications (not sure what you are trying to say with this word...) every day and my boss is satisfied because she appreciates the fact that I'm interested in doing my job as well as I can.

Good job

I'm actually working in a [community] center, teaching IT to old people. I only have to go twice a week, for a couple of hours and I really enjoy it. Every day is different with them, they are people who really want to learn different things, (not only about IT), and they have a strong determination for gettingachieving [reaching] their goals. 

In general, they are very grateful, people which motivates me gives me more, in my job. I have to confess that some days, I feel a bit stressed working with them because they are also very impatient. too, Even so, though I have realize that I love teaching above all things, and that makes me feel better. 

I think that I set my heart on my explications [expectations] every day, and my boss is satisfied because she appreciates the fact that I'm interested in doing my job as well as I can to the best of my ability.