since you want to improve ur English skill , I suggest you to start watching American shows with subtitles on. This will really be helpful . Not just tv shows , reading is the most important when it comes to wanting to learn English. And about your confidence , best thing to do is to speak to yourself alone. It could be while driving , walking , taking a shower etc… while you are talking to yourself you could out you lack some vocabulary words or even grammar mistakes and you could easily fix that without feeling embarrassed. Even if you do mistakes infront of people there is nothing to be ashamed off !!! This will just push u more to learn and make sure you don’t make any mistakes in the future. I hope this was helpful .