Agh, I have the same kind of problem as you - oh how I wish I had a visible eyelid! But my crease is so hidden. Poo.
I make do with what I have - like the others have said, creating a crease of my own. I add a darker shade to the part of my eyelid that feels like it's sunken in - pretty much right in the middle between my eyebrow and actual crease. When I first did this, I looked like I smudged some dirt on my eyes - not a good look.
With this you really have to be precise (I use a small brush) to contour your fake crease, and then I blend the sh*t out of it! Keep the area of the dark colour small to avoid looking like you got punched in the eye. Whenever I add any darkness to the eye, I like to really brighten up the inside corner, so that my smaller Asian eyes don't look like they're buried in colour.
But really, I had to practice a LOT of times before I could create a crease that I was really happy about - and the videos that reesesilverstar suggested would be perfect to get started on. Just keep experimenting, no one knows what looks good on you except for yourself!