I am 18, study at university, and personally, for me it's like school, no difference really, so, don't think like it's something very huge, that you can't overcome only because of your stutter, how it effects me? Well, not gonna lie, it's bad, it messes with me a lot, i have depression, but i do have advise - confidence, yes, simple, yet hard at the same time, but, if you are confident about yourself, then you won't have any problems at all, so, mate, please, don't let it brake you, it doesn't mean that you can't enter university only because of your stutter, go to your dreams dude, you got this