@Roseli2015,
Watch your favorite English language TV show or movie, and as the characters speak, repeat loudly the exact words they are saying the moment you hear them. In other words, 'shadow' their dialog in real-time. Don't worry about getting every word or sound right - focus on listening carefully, moving along quickly and keeping pace. After the movie ends, repeat the exact same movie and do it again. And again.
Be confident and speak as often as possible to as many people as you possibly can! Do not be shy to make mistakes! The more you practice the better and more confident you will become in your pronunciation and vocabulary.
Use Google Translate When you are unsure of a word or a pronunciation of a word, ask google! It's easy to use! Enter the word in Google Translate and listen to the correct pronunciation by clicking on the audio button.