My attempt to write a letter in English (informal)

Hello, Bill!
I’m grateful for your letter. It’s very important to me that you don’t forget about writing to me. I’m really sorry I didn't write back to you at once. As I remember you had asked me about my plans for the further future. Well, I have lots to tell you about.
I am having the most difficult time right now. I need to choose my future profession. At first I thought of being a doctor, but now I have some doubts about it. I’m not sure this profession suits my temperament and at the same time I have no other options. That’s why I’m planning to enter a Medical University. I’m thinking about entering a foreign university. The universities of Sweden seem me to be the best option now. They have many advantages over other universities: low fees for education and living in residence, new Science Centers, an international diploma. If I graduate from a Swedish University maybe I could stay there or move to Canada. May be this is just a fantasy, but I can dream!
I’m sorry but I have to stop writing to you. It’s too late and I’m falling asleep. So I hope you’ll tell me about your plans for the future.
Best regards,
Helen

Молодец! У Вас превосходный английский!

My attempt to write a letter in English (informal)

Hello, Bill!
I’m grateful for your letter. It’s very important for me that you don’t forget about writing to me. I’m really sorry I haven't written back to you at once. As I remember you had asked me about my plans for the further future. Well, I have lots to tell you about.

Now I think I have the most difficult time. I need to choose my future profession.

For the first time I thought of being a doctor, but now I have some doubts about it. I’m not sure this profession suits my temper and at the same time I have no other options. That’s why I’m planning to enter a Medical University. I’m thinking about entering a foreign university. The universities of Sweden seem me to be the best variant now. They have many advantages over other universities: low fees for education and living in residence, new Science Centers, an international diploma. If I graduate from a Swedish University I wish I would stay there or move to Canada. May be this is just a fantasy, but nobody can forbid to dream.
I’m sorry but I have to stop writing to you. It’s too late and I’m falling asleep. So I hope you’ll tell me about your plans for a future.
Best regards,
Helen

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   Hello Helen.  That is a wonderful and logically coherent letter, addressing your friend and his questions.

 You can be proud of it. There were only some minor errors of a common variety for those learning English.  

    Very good indeed, and most encouraging. ----Warm Regards, Bruce