I get that momentum thing. It is worse for me in loud environments or with lots of particularly out-going people. And feeling ignored sucks. Especially if it is a pain in the tit to speak. I guess practicing would help with comfort (not necessarily stammering but confidence) so that you can command attention more. You could try talking to some of them one-on-one if you want people to like you as a personality. I know people without a stammer who are much more vibrant and talkative when in one-on-one. Not to get personal, but I don't think you should define how you see yourself as a man based on how much attention you get in a group conversation. Often the people who are like that are assholes who don't amount to anything. Think about it, you are trying to speak to multiple people with a significant hinderance. Surely that makes you more of a man?