Do what you want

My major is electronic information science and technology. I fell in love with programming when I was a young boy. I was deeply attracted to computer science. It's amazing. I give it nearly all my attention and spent a lot of time on programming during my college life. However, I didn't choose a job in IT when I graduated from the college. Now, I do program as my hobby, it make me happy. I think people should do what they want, it's the key to happiness.

Hope this helps.

Letters

Last night, I just felt like writing a letter to my friend. Although I was supposed to reply to her, I had not. I had almost forgotten it. When I remembered to write her back, I started to write as much as I could like I was waiting for this moment. It had* been a while since I wrote a letter to someone. After I was done, I just thought back on how I used to write letters to my best friend. I didn't know how she was doing, so I wrote her a letter impulsively*2.

Today, I visited the post office. I imagined my friends' countenances and their surprise. They might notice my yearning for them. A letter is very peculiar, it gives expectations and pleasant feelings(*3) to both giver and taker.
Even though technologies have developed more convenient ways to contact people, they will never replace a letter.

* "has" isn't wrong but the rest of the note is in the past tense.

*2 Not quite sure what you're trying to say here. I think you could also use "spontaneously".

*3 Again, I'm not sure what you're saying with flutter.

I liked this a lot! I'm also fond of writing letters and also often forget to do so.

My journey

I feel depressed. I am a teacher and today was very hard with the children. They were very excitable and really pushed me to the limit . Nevertheless I have a lot of patience! I wanted just to say that.

Hi Sophie.

One minor correction on top of that given above. If you're working with children, the job title is probably teacher. Professor is reserved for a position at a university.