Well, don't worry about approaching. I was never born with AA, as I approached various people since I was 4. I have only had one case of AA, but that was pressure through friends and not target. The thing I put in my head when I approach is whether or not u have something to learn from said target. It really is a "screening process" on whether or not they are worthy of you. If anything ever goes wrong, my thoughts are just "Fuck it" and challenge myself to see if I have the balls to push and fuck up until I get absolutely ejected. That's a more psychological thing for me, but I act like it's a joke for my ego purposes.

I agree, opening groups are harder because of the multiplicated pressure, but I would start with a controversial opinion like ketchup or mustard, is it called cinnamon buns or rolls, and justify it with you have a bet with a friend on who has more people to agree. Make up your own, and most of the time people will argue with each other within the group, where you take your side, make your friends and tease the opposing opinion group by saying they have bad taste, etc. Say you will Give them another chance by asking them music, or other opinions. Now you are in group and know a lite about them.
As for talking and shit, although it's loud, you MAKE yourself be heard. Have a strong prescence and demand their ears. Talk at their face if you have to. Usually they will want to listen to what you say because nobody is rejected without saying anything. When they show you their ear as a gesture that they cannot hear, do you lean in and speak at them?
Remember, demand attention. They want to listen to you, so get whoever you are talking to to lean in and listen to YOU. Never lean in to other people. Motion for them to come closer. Gl!