How Can I Improve My English Knowledge Both In Speaking And Writing?

I took 3 semester English classes in California at MJC college, in Modesto.
Then I went to Cosmetology school for 1 year to get the Cosmetology licence , I worked different places as receptionist in dental office, hair dresser, and now at front desk in university, but I would like to speak fluently in common English slang, or ever when i heard different accent in language like African American accent it is hard to me to understand,so at that time, the speaker is thinking that may be I am Dom! It makes me crazy and I lose my self confidence when they laughing at me, or looking at me , I know what  they are thinking about me , but I have55 years old and I know 2 more languages, and I do like to speak like native American, the other thing that I supposed to tell you is I am living in United State for 8 Years!! Please guide me what exact book should I read to improve an English conversation.
Thank You so much.
MY e-mail
Valantin@msn.com

All and sundry wants to improve his/her English in one way or the other. Learning English is a three steps process. First, you are supposed to learn English by reading English books and other stuff that is available. Then you should consider each and every word worthy and should seek for their meanings. Next step is to write English, you should write essay, dictation, articles, etc. last step is to speak English. At this step they would be able to speak English at ease. This will work with pronunciation of words and flow of language you have learned.
You should listen to English channels. You should go for reading very good books of English. It is better to avoid poor English stuff. You should go for good stuff so you could not learn useless things. Instead you can give time to your friends and others who are adept in English. They will obviously talk to you in English. You would not feel shy before them. You may err many times but it will be okay as your dudes would be there to edit you poor English stuff. All the best!

You should listen to English. At this step they would be able to speak English at ease. This will work with pronunciation of words and flow of language you have learned.
Useless things. Instead you can give time to your friends and others who are adept in English. They will obviously talk to you in English. You would not feel shy before them you may err many time but

If your basic English grammar are not proper so how you can improve your knowledge, So please try to improve your basic English grammar then you can improve your English knowledge both In speaking and writing.

Speak louder and read and read always?