When I'm in a group of acquaintances I find it really difficult sometimes to get a word in edgeways. I tend to 'collide' with someone else who's talking and (worse) sometimes I'll start with my bit and someone starts 0.5 - 1 second after me essentially cutting me off. What's the best thing to do?

oftentimes in set especially, i have a lot of cool things to say that would make me look good, but i dont hesitate to forget about them. its much cooler if youre adding onto a topic rather than talking about a new topic get it? thats why people listen too its because they're already talking about a subject so just add on to it and enjoy. try to take it to new places. Also in a conversation its cooler to say witty, smart, funny things in response to another person than just say something cool or funny randomly

You probably have low social value in your group. You are describing one way of how high value people treat those of lower value tbh. Changing a groups perception is going to be difficult, and it will take for some time for them to accept your new , higher value that you are learning here int he PUA community. You may want to leave those people behind that wont treat you as an equal an dont make the same mistake, accepting 2nd class behavior going forward.

I had this problem. What worked for me was just dominating. I learned how to lower my voice a good 5-6 notes and make it more masculine, then when someone tries to interrupt me I continue unfettered, making eye contact with everyone in the group except the person trying to interrupt me. Me: "Oh I have blabla to say about this" and The girl: "Well lets get going we have to do such-and-such (I want to sh1t test you and see who's really in control)" Something like "The giant-donut ring (whatever she's trying to pull you to) will still be there in two minutes". Something to hold your ground.

The problem with trying to dominate this group is that your status has already been defined and you probably don't have the tools or experience to overcome it. Not yet, anyway

I recommend finding new friends, because:

1) If you meet a girl and bring her back to the group she'll pick up on their SPAM of you.
2) It is common for a PUA to lose old friends and gain new friends as he starts to master the game. In fact this happens whenever one person develops a significant interest or advantage relative to the rest of the group, such as when he suddenly comes into wealth, learns to play guitar, becomes an athlete, etc.
3) Just like there are millions of women out there and a guy should never get one-itis because there are so many other women out there who could make him even happier or which have fewer problems, the same goes for our friends too. There's probably a much better set of people out there for you to hang out with.

All that said, you should use your friends to your best advantage-as an opportunity to go out and meet new women and new friends, just don't bring the new recruits to meet the current group. Don't try to one-up the old friends with the new ones, just let them go when the time is right.

Talk with confidence if you ever want people to take you seriously

I think a combination of what people said. First, I would try speaking up louder, more clearly and more confidently and when someone interrupts, you keep going instead of stopping for them. Try this for a while. If it doesn't work and you are constantly being drowned out then I agree you are probably with people who don't really respect you. In this case, you should start looking for a different group.