Nice to meet you, sir!

Hi. sir. My name is [Name] Kim and also have English nick name as Steave. I also think It\'s ok to be called Mr. [Name]. I\'m 53 years old. Maybe you think I\'m so old age to study language. But I want to try it even now because I didn\'t my best effort when i was young. I\'m a plant manager. Sometimes I meet foreign visitors. But every that time I really harded to talk with them. I couldn\'t express my opinions well. So I hope you help me. for some months I studied English in this site. So I feel I have been better than past. But I think I am just beginner. Especially It is hard to listen English. To be honest there were many times when I didn\'t understand during talking with the teacher. And I feel difficult to use tense words like present, past or completion tense. In addition It\'s hard to use \'a\' or \'the\'. Sir, I hope You help me to study English well please. Thank you.