Hello, aaah look this is the problem of every student of English as a second or foreign l a n g u a g e this is the reality a great majority have the problem with pronunciation even teachers themselves Allah ghaleb we didn't get much courses and specified time for it needs much attention and listening today you don't know how to ronounce a word tomorrow you will step by step till you over the nightmare
another obstacle is the Self-confidence problem if you don't trust your mind and your abilities you will fall in this problem everyday especially when you consider your teachers as a native speakers don't mind your teachers passed this problem when they were beginners or maybe at advanced points, sometimes it happened when you think your classmates never make faults that's it just relax and smile laugh say I don't care yeaaah that's me
good luck