Just because you're eating out does not mean you need to conform to eating the oversized entrées. One thing that I often do when I am eating out is order from the starters/appetizers on the menu. Not only are the portions way smaller, but I am also able to get a taste of more foods than just one giant helping of the same meal. I've even gotten my husband on board by convincing him that it's just like eating tapas, which means we're able to split a few starters between us. Be careful though, small portions of some starters pack a lot of calories, so steer clear of menu items containing buzz words such as creamy, fried, and crispy.
Just because you're eating out does not mean you need to conform to eating the oversized entrées.