borrow trouble

[borrow trouble] {v. phr.} To worry for nothing about trouble that may not come; make trouble for yourself needlessly.

Don't borrow trouble by worrying about next year. It's too far away.

You are borrowing trouble if you try to tell John what to do.

Compare: ASK FOR, CROSS ONE'S BRIDGES BEFORE ONE COMES TO THEM, CRY BEFORE ONE IS HURT.