I have been reading around about how 1 in 10 people cannot see the 3D in the 3DS so i'm pretty darn worried about it. so the questions in the title.

If you for any reason have trouble seeing stereoscopic 3D, it's not a deal-breaker, as all games can display in 2D by simply setting the 3D slider to the off position.

If you CAN see 3-D with stereoscopic glasses like your thread title says, then probably the 3DS screen will work fine for you.  If you're worried about it, there are demo stations all over the place this week.  Nintendo's site has a 3DS demo station locater.  They're mostly at Best Buy's.  I tried out Pilot Wings on Monday night.  It's a different kind of 3D than the promotional videos suggested.  Things do NOT fly out of the screen at you.  It's more like a polygonal diorama a few inches deep. 

Set the 3D mode to "off" and you should be fine. 3D is not required to play the games. If a developer does manage to come up with a way to make 3D work as a required game mechanic they'd surely be telling us about it, so it would be easy for you to avoid.

When was the last time you had an eye test? It's those with vision impairments, underlying conditions that may not be able to perceive 3D. If on your last eye test nothing notable was mentioned,  there's no need to be too concerned. Admittedly, I was a little concerned, but when I tried it out earlier this month, the first thing I said was, "this shit works", to the sexy Nintendo hostess. 

Its great that  you can turn the 3d off if you cant see it or if its uncomfortable. but I wouldn't be able to justify $150 on a 3DS without 3D....

" Its great that  you can turn the 3d off if you cant see it or if its uncomfortable. but I wouldn't be able to justify $150 on a 3DS without 3D.... "

go to best buy or somewhere to test it out for yourself