Does anyone else have this problem?

I've come to a point in therapy that I find myself rambling instead of talking. I don't think I was like this at first. I mean that I'll have an idea of what I want to talk about, then I get started and I'm distracted by several different thoughts mid-sentence. Sometimes I don't even get around too the original topic.

I'm embarrassed about it because I can see that my therapist is trying hard too follow patiently and I feel like I must be so frustrating to listen to. (It also annoys my partner.)

Sometimes I wish I could just keep a train of thought and relax.