This is going to depend so much on the culture of your team, it is hard to give advice. Maybe ask other members of your team, and your team leader for feedback

This is going to depend so much on the culture of your team, it is hard to give advice. Maybe ask other members of your team, and your team leader for feedback to see if it is a problem. Being cultural, it might be that the team 'likes' this and sees it as a good thing, or they might think it is an annoying distraction. If you have to joke less, I don't have specific advise for that. It depends if it is hard for you to stop, like an impulsion, or something easy. If it is easy you could just not joke unless it is the start of the meeting when you are waiting for people to arrive, or a specific "social" meeting just for the purposes of getting together. Also retrospectives are more laid back than say a critical bug meeting, so it all depends on the specific meeting. Like others have said, if you have to be serious and you are just not, then you might have a miserable time. But I am sure you can find a team/company where you can be yourself. It sounds like you are worried, but it is not clear that the team you are in see it as a problem until you ask.