my difficult problem

I have had many problems in my new life since I came the united states. language is actually hard to study. I feel uncomfortable when I talk with someone on phone that is really hard to listen and understand. someone told me that didn't be shy.furthermore,my cousins said that I should make any conversation with anybody if you could. I think my serious problem is how to remember or keep vocabularies in my brain.
the vocabularies definitely have many meanings that depend on what we talk about.we often don't have rules to spell that is why I have to memorize them.many word have a same sound that make me really awkward to remember and spell. I often forget vocabularies if I don't use them many times. sometimes I misunderstand the meaning of words. I sometimes read books, but my vocabulary raise up really low. that is why my vocabulary is really serious problems in my life.
I will study in college in the near future, so i have to build up my English. I am not good person to study English. I really hated to study English when i was a child. when I studied in middle or high school, I often taught about grammar. the teacher often didn't care about remembering vocabulary. That is one of the causes I am poor vocabulary guy.
maybe I have to make another plan to remember vocabulary better. I should read more books this quarter. I am still working hard my homework. I just want to be a better guy. Maybe my serious problem is still remembering vocabularies.