Even worse the staff room is even more clique based than the playground.
How do you know this? Just asking because if you're anything like me, you're predicting the future. Worrying a lot about a situation that we haven't even been in, will not make our fears come true.
If you go into this worrying about it, then it'll make things difficult for you. So, I imagine you've got some time before you actually go into a placement? Use this time to convince yourself that it's going to be great. Here are some good reasons why it's going to be great:
1. You're going to do something you really enjoy. You said it's your dream! So that will definitely help with the anxiety overall because you'll be happier.
2. Teachers come and go from schools, even more so nowadays. You're not going to go somewhere where the only teachers are super old people who've been teaching there for 50 years and all know each other.
3. You'll have something in common with all the teachers because you're all doing the same thing. You're not being shoved in with a load of randoms.
4. Best tip for self confidence I was ever given: FAKE IT. Pretend you're confident even if you're shaking. It's difficult but practise makes perfect

Start by simply walking tall, back straight, head held high and people will think you're confident even if you're not. Also, when you meet another teacher, shake their hand. I remember having to get used to this, and it was super scary. What you've got to do is just go for it, don't even think about it. As soon as someone comes up to introduce themselves, say your name as you shake their hand and then say their name back to them (if you're anything like me and can't remember names). This gives of a good first impression. After all that, just smile and be yourself!
As someone who did a music degree, I know lots of people who went on to do teaching, and they all agree that while it's challenging, it's also a great job. They're all really enthusiastic about it, and many of them have certainly changed for the better since starting the job. You're going to be great!

Oh and one last thing - as for talking rubbish constantly, I do it all the time, and I don't have social anxiety. There is nothing wrong with talking rubbish, pretty much everyone does it sometimes
