Struggling with English speaking, seeking advice.

I'm sorry. I don't know where I should say this. As a malayalee and studied in a Malayalam medium school, I don't know how to speak English well, I only spoke Malayalam all these years. When I try to speak in English my brain will automatically shuts down.Now, I got a job by luck and my job demands speaking well in English. The meetings are in English, and I can't express my views or ideas there because I lack confidence. Now a meeting has done and I couldn't speak a word in English and I feel so humiliated by it that's why I'm posting this here. Does anyone here went through a situation like this? I've also joined some spoken English classes but nothing worked. Now I don't have energy to spend more money or time for this. Could anyone overcame this situation please suggest some ideas to overcome this. Also, please excuse my grammar mistakes.

Edit : Thank you so much for your kind responses. I'm really happy and overwhelmed by the responses here. I didn't expect this much responses. As you guys have suggested I always prefer to watch movies or dramas in english with subtitles, I think the problem is I'm not using it anywhere. I will definitely follow your suggestions and Thanks once again for the immense support.I'm not able to reply to each comment, that's why I'm editing this post.