I wasn't either. Till DW lost her license. Went to replace it, and they needed the marriage license for proof of ID. Got the new license and it had my last name on there. It kinda happened by accident...lol
When DW went to get a new Israeli passport, a few years after we were married, they wanted to issue it with my last name (we were married there, and apparently they just change the name by default). So she had them change her name back to her maiden name, before issuing the passport, to match everything else.