1. I'm worried about my English.

Question

- Why don't you practice speaking more?

2. I'm worried about English.
- ( )
(Is this correct without 'my' before 'English? What is the difference between #1 and #2? What will be the answer to the question 2?)
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3. I'm worried about my soccer.
- Why don't you practice kicking balls more?

4. I'm worried about soccer.
- ( )
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What is the difference between #3 and #4? Is there any difference between them? What will be the answer to the Question 4?

Answer 1

In both cases, "my" infers you are specifically concerned with your own performance.

2. English speakers may not be plentiful in the country I am going to visit.

4. Soccer is not as popular in the United States.