Hey Babycoconut! I've been wearing both contacts and makeup since I was twelve and I remember being a lot harsher to them than I am now

I've never had eyeshadow falling into my eye, though, but from what it sounds like, maybe you need to use a better base to keep them in place?
I know that when I try to use lustres like mythology, or pigments or anything with glitter without a base, they go all over.. but since they're on your lid, it's actually your lashes' job to keep them out of your eyes!
I also try not to use anything to glittery near the inner corner of my eye (highlighter!) because that's where I find it gets into my eye the easiest, right next to lining the waterline, so I skip that mostly..
Just my 2cents, hope this helped!