Brittany Cartwright is facing her fears head-on in "Special Forces: World's Toughest Test" ... but not without a serious struggle when it comes to jumping from a helicopter.

TMZ obtained an exclusive clip from tonight's episode showing "The Valley" star battling major nerves as she prepares to make the leap. With the chopper blades spinning overhead, Cartwright admits just how overwhelming the moment feels, telling the camera how terrified of heights she is. Fox

In the clip, she hesitates, inching toward the door, desperately clinging to the rope as she hangs over the helicopter skids, unable to let herself go, as the guy in charge yells at her to "Go, go, jump!"

She explains, "I'll walk on a balcony in a hotel with my back up against the wall so that I don't have to like get clos

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