Speaking in groups

It does not matter if it is professional or personal; I do not speak that much in a group setting. I am better speaking one-on-one or in a small group of friends or team members.

It is sometimes hard to get the words that I need to get out of my mouth. Therefore; it is best to speak around those I trust or can communicate with. I often forget what I was about to say, and half the time I cannot remember what I was trying to say. I also sometimes cannot structure the communicate correct and stop myself from speaking. This presents less confusion.

I do however sometimes speak and it comes out all wrong. The response/question/comment is not structured towards the conversation and it makes it hard to feel "in" the group conversation.

I email/write things down quite often to ensure my communication makes sense or is understood.
I always double check emails after I send to double check my personal/professional communication to another. Sometimes this is my easiest way to communicate with others.

Best suggestion; learn your communication method and learn when the confusing/misunderstood times are.  Look to others to identify the communication method that best fits your opportunity to inform others of the response/comment/question to the topic.