I encourage you to improve you English skills, but you should know that native English speakers working in diverse settings are accustomed to being around non-n

I encourage you to improve you English skills, but you should know that native English speakers working in diverse settings are accustomed to being around non-native speakers with varying levels of skill. You probably aren't being judged harshly for speaking with an accent or missing articles. Even many native speakers have difficulty speaking continuously or extemporaneously. I think you may not need to worry about it so much. If you still want to improve, there's absolutely no shame in learning in a classroom setting. It may be the best thing for you.