always try to speak in english ,whoever u talk to

Pure discipline.

It is not possible to avoid influence from your mother tongue. I think what you mean is that you would like to be like a native speaker of English. Actually, very few language learners of any language reach a level where they are like native speakers of that language, so that is actually an unrealistic goal. Nevertheless, you most likely can learn English to a relatively high functional level of proficiency. Try to get as much exposure to English as you can, and make sure that it is language you understand, at least a little bit. Reading questions and answers on this site is a good start.

Read lots of books,newspaper,magazine that are in english.The next thing is that just speak in english wherever you go,don't be scared if they laugh at your language.Tell them that i'm learning,if i want to be a good i need to speak althuough it doesn't sound correct.It's difficult to not have influence in mother tounge cause we are used to it since young but you can if you want to .Just try to speak english anywhere or everywhere you go if it's possible.Learn from mistakes.

hi
the best way to think of learning is that you speak when ever possible
this is the one which worked out for me hope it works for you to
whenever and where ever you find the time please speak in English though you are not perfect with this way you can accustom to speaking and that will help you a lot
bye

Practise makes perfect. Pronouncing the words and frequently using them would help . Talk to yourself in English , if there is nobody you can talk with. The Internet would help you. Webster dictionary has a word pronouncer. This can help you with the diction.