Struggling with Communication in My Relationship

My boyfriend and I have been arguing lately and we don’t usually argue. Idk how to have a discussion without getting emotional about it, which usually makes things worse. I have a hard time with communication as is, so it makes it harder when I don’t know what to say or how to act in an argument/discussion. My boyfriend usually ends up making me feel like a child during these conversations, he doesn’t belittle me or anything, but it still doesn’t feel good. It doesn’t help that he can’t stop talking long enough to let me respond and then he’s on a different topic and I didn’t get to say anything. I’ve tried to explain to him, but he told me to just cut him off with my thoughts, but that’s not how conversations work. I try to avoid arguing at all costs.