I hate having small talks and not being able to tell long stories

So i’m a student in italy and i communicate to my peers in English (my second mother tongue) but idk why i cannot hold a long conversation and I’m 80% a listener. I cannot organize my words well, i mix up the whole idea i’m talking etc. Even in my first mother language it is the same to some extend. I was a shy and quiet guy for most of my life. What should i do? I appreciate your guides and tips 😢