Certainly you can make yourself understood by speaking even very broken English. As long as you live in a country where English is not the primary language, you will be fine. Billions of people worldwide lead happy and successful lives without speaking English.
If, however, you plan to move to an English-speaking country, then you will be a second-class citizen until you learn to express yourself intelligently- by using proper grammar. You needn't be perfect- native speakers make mistakes- but it should be better:
"I can't arrived to the United Kingdom but I don't think so It's nessecery to learn English very good."
I have no idea what that means.
You're 19- old enough to make your own decisions and abide by the success or failure of those decisions.
Student or Learner