I was what you call a 'gawar' in english, absolutely terrible, and couldn't speak a single sentence. It took some time, but it got better.
How? Unconsciously, i used to watch a lot of english movies, listened to a lot of english songs, read a lot of english newspapers and tried to act cool in english with my friends. I never realised this, but overtime i became really well in articulating my thoughts.
All in all I'd say, give it some time, try to converse in english as much as you can with people who will help you through it and won't call you an angrezi ka 14 for the same. All the best man, you got this.