Afraid of telephoning others

Recently I found that I am always afraid of telephoning British people [1]. I want to apply for some voluntary work as it's a good chance to talk with local people and improve my English. But when I contact others I prefer sending an e-mail instead of just calling him or her up. I know using a mobile phone is more convenient than mails [2, 3] because through emails people need to wait for a long time for replying to receive a reply. But I am worried about my English as I can not catch up [4] with what people say through on the telephone. Besides, I don't know how to give make a call properly, such as what I should say at first.
Hoping I can overcome this problem later.

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[1] 'British' is an adjective, so it needs a noun.  As examples:

"I like British people."

"I like British movies."

The noun is 'Britain'.  You sentence could as be written as:

"Recently I found that I am always afraid of telephoning Britain."

[2] The word 'mail' is its own plural form.  As examples:

"I received mail." (Whether one letter or ten letters.)

"I received a little mail."

"I received a lot of mail."

"I received one item of mail."

"I received ten items of mail."

[3] The word 'email' has the plural form of 'emails'.  Hence, it is different from 'mail'.

[4] The phrase "keep up" would be much better here.  The phrase "catch up" is usually something you do after an event.  For example, if you missed a week of school, you would need to "catch up" over the weekend.  The phrase "keep up" is something you do during an event.  For example, if the teacher talks quickly, you would need to write quickly to "keep up" with the teacher.

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Your written English is very good.  Do you have a language partner on Italki?  If you do, perhaps you can practice a phone call with him or her.  He or she can tell you whether your English is good enough to call people in Britain.

Afraid of telephoning others

Recently, I found find I am always afraid of telephoning British people. I want to apply for some voluntary work as it's a good chance to talk with local people and improve my English. But when I contact others, I prefer sending an e-mail instead of just calling him/her up. I know using a mobile phone is more convenient than mails email because, through emails, people need to wait for a long time for a replying reply But I am worried about my English as I can not always catch up what people say through over the telephone. Besides, I don't know how to give a call properly or what I should say at first. 

Hoping I hope I can overcome this problem later.