As to knowing if one is the endless talker, I thought of a clue … totally unscientific with no basis, but thoughts from life experience.
The #1 to me — Are you both verbally participating, maybe not equally, but both have stretches of expressive verbal time? Check in on that during every conversation.
Conversation is about taking turns. If you find it hard to be quiet and let the other person talk, let them fully express what they want to say, then you might be a dominating talker.
If they aren’t volunteering, any thoughts of their own, they have probably checked out of the conversation mentally.
Ask their opinion about something. Ask a basic question, even informational. Sometimes it is “breaking the ice,“ letting them hear their own voice to make them comfortable to continue speaking.
The other person might take the conversation in another direction. You might be left with things you wanted to say, but the topic changed. And they might go on for a bit themselves, beyond your interest in whatever they are saying.
That has to be ok as part of conversation. They may have felt the same about you!
If the other party is not saying much, just “uh” and “I see” and such, that’s a flag that it’s time to slow down. Even be quiet. They aren’t interested and are being minimally polite.
If they aren’t making eye contact and are repeatedly walking away and back on little tasks, while not engaging, likely real interest isn’t there.
Truly outgoing people who are liked by others ask questions and listen well to the answers. Just the simplest things. Did you grow up around here? I thought Jane‘s new saddle is really nice, have you seen it? Do you do any trail riding, or just focus on showing? Anything is fine. It doesn’t have to have a point. And it can lead back to some thing you are interested in.
You won’t lose friends by talking less to them. It’s the opposite. You may gain some. Even allow acquaintances to become friends.
They don’t dislike you, just one-sided talking. They just want respect for their own preferences in conversation. As soon as they get that, they are happy with you.