This is completely normal! This improves with more conversation practice and just over time when learning a language :)

Hey, great question. And great comments, by the way. One way to stop translating in your mind is to be prepared (hello, boy scouts). Before meeting someone, think the conversation over in English. Play the possible future dialog in your head. Think of good collocations to sound naturally. The meeting will flow like a charm. Same before English class. And enjoy the process.

You are not alone. Everyoine does that in the beginning and on some things. As the wise Hilary says, practice. When your brain is totally at home with phrases and constructions from a language it can use them directly. Repetition? When it become familiar it flows.

The most effective way that I know is to spend as much time as you can having conversations in English with native speakers of English who do not speak your native language. When it is your turn to speak, try to speak without translating first. You should expect to make some mistakes, especially at first; this is natural and normal to the process of learning to speak better. Over time your ability to speak in English without translating consciously from your native language will improve. I started learning Spanish at age 14. At age 17 I visited a country in Central America for 10 weeks. I lived with a family that had a son that was also 17, and I went to school with him. Almost no one that I met could speak English, so most of the time I had to do my best to speak, and to figure out how to say what I wanted to say using the word I knew. Over time I learned more words, and I got better at not translating in my head before speaking, and I gradually made fewer mistakes when I spoke.

Practice, practice, practice. There is no shortcut, or 'hack' as I believe people like to say these days!