You had tried to talk to all three of them.

First, you had asked Minho to talk. And he had replied with "I'm busy, go away."

Then, you tried to talk to Thomas. Who replied with "not now."

And then, you tried to talk to Newt. Who had just said "later."

The next day and all 3 of them were looking for you, the doors had just closed to the maze. That's when Newt checked your hammock and found a note.

You had written to them about how you had gone into the maze to try find an exit, on your own