Fear of Heights

I've always been afraid of heights but I'm not afraid to jump, as long as there is a lifeline or there's some deep water below. I've climb tall trees or been on top of tall building and looked down, rode zip lines that zoomed above the treetops but I'm still afraid of heights. My legs still tremble every time I'm up there but I'll still look down. I still can't figure out if I've conquered my fear or not.

Whatever the case maybe, I'll still jump if it's worth it?