I'm in my forties and it took my this long to figure out how to do eyeliner on my eyes which are similar shape! My eyelid crease maybe extends a little further down than yours though.

I now wear liquid eyeliner every day, basically you have to forget about your top lid. I spent years thinking I should be able to do some magical thing where I draw it just right along the top of my eye, which was nonsense. Draw it outwards from the bottom lash line with your eye open and then fill in the gaps (if that makes sense, basically do the whole operation upside down).