Since this left you feeling bad, you should probably do something about it, and not just ascribe it to a personality or style of your boss. It probably is (for example different people use different pause lengths as a sign that it is your turn to talk now) but if it's upsetting you, do something. You have lots of choices about what to do:
- reassure yourself as your boss talks "It's not that [boss] doesn't care what I think. [He/She] just thought I was done." Wait until the boss is done, then add your points to the meeting. The aim of the meeting will still be met, and you will minimize your hurt by surfacing the facts to yourself. Also make a point of noticing how the boss reacts when you continue your point. Is the boss interested? Seem pleased with you? This can also add to your reassurance.
- don't yield the floor. When the boss starts to speak, say "Hang on, I wasn't finished" or "just a minute". Hand gestures like "stop" also work here. This may momentarily upset your boss, but a person who interprets short pauses as turn-ending markers is probably used to being told they jumped in too soon. A self centered bully who doesn't care if you were done or not also won't care that you didn't yield the floor. It's all water off a duck's back.
- arrange with the meeting runner for more explicit turn taking. This might mean asking each person to turn to the next one for their daily report, or the meeting runner doing that, or a "talking stick" to be passed around.
- ask one person you trust whether the boss is specifically talking over you more than other people, and if so whether it's perhaps because your pauses are longer or something. This person might remind the boss at times to let you finish.
I don't recommend going and having a meeting with the boss about this. It's not that big a thing, don't make it a big thing. Save that for if the boss is constantly talking over you and nothing anybody else does helps.
(I have a pair of people in my life where one talks over the other when the three of us are talking, and I know he really respects her but he just jumps in all the time and she's saying "hang on hang on" while he interrupts but he still does, and I tell him "let her finish" and it does help. He just doesn't notice because he's really engaged in the conversation. He does, however, back off when reminded, and if your boss doesn't then you might need a one on one about it eventually. I have another person in my life who has ENORMOUS pauses without yielding his turn. I am always a little off balance in conversations with him, because I am never sure if it's ok to talk. Since neither of us is good at eye contact we give and get less cues than some people, too. To his credit, he takes being interrupted very well, and will explicitly cue me to talk with prods like "right?" or "what do you think?" but I am always tamping down a pressure to jump in when he pauses for so long, even though the content of the conversation makes it clear it is not my turn.)
Do you get interrupted in any other contexts? If so, consider adopting a habit that lets people know you're not done. The "filled pauses" of English (er, ah, um) are apparently a way to say "I'm thinking, don't interrupt", for example. You can rearrange sentences so you say "for example" [long pause] and then provide the example ... that intro phrase leaves people knowing there is more coming. You can also use explicit body language like leaning back, stepping back, putting down the whiteboard marker, or sitting down to signal being finished. If you don't signal you're done, you're not done. Now, don't get into all of this if this is one person who interrupts you in one context. (Or did it once, in one meeting.) Rub some dirt on it and walk it off. But if it's a pattern, learn about it.