I sense that my thoughts and opinions aren't valued or considered.

Hello, Reddit community. I've been in a wonderful relationship with my girlfriend (f33) for over a year now, and we've shared countless happy moments together. I've never felt this kind of love before. However, there's one issue that bothers me: my girlfriend often interrupts me mid-sentence to say she already knows what I'm trying to explain, and her tone can come off as irritated. This happens even when I’m discussing simple things like my favorite movie. It feels like she views me as not very smart. I’m unsure how to address this without upsetting her or making her feel defensive, but I genuinely feel like my intellect isn’t being respected.