How to resist the urge to interrupt someone in a conversation?

I get excited very easily and when it comes to a topic I’m very passionate about I just have a million things to say. I really do care about what the other person has to say because I know understanding eachother’s point of view is what creates that connection. However, I have such a hard time waiting for the other person to finish speaking and I often interrupt them. Sometimes I catch myself doing it and I apologize. Sometimes I dont realize it until the conversation is over and I feel like sht afterwards. How do I control myself?!