Tried masking. What did I do wrong?

Switching schools. Thought maybe masking my autism would do good for finally having friends.

Here's what I did:

1- Sit on the third line: not too much back, not too much on the front;

2- Get pretty. Bracelets, jacket...

3- Watch them talk and imitate what they talk about when they talk to you.

Well, didn't go this well. Still getting ignored (I like to joke with my brother that "Neurotypicals have autism detectors").

Where did I miss it? I tried joining some conversations I heard, but they were pretty unkind at me after that.