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a year is a short period for a plan like that, and so that means she has someone in mind
anyways, if you like her enough, then tell her as friend what your expectations of your future are, including the ones she may not like. i think is fair, and if anything happen after that between the two of you then at least you'll both know what's on the table
the truth is that we may set all these bounderies, goals, expectations, etc about for our life and we always try to follow a "plan" but nothing is guarantee that the plans will change or that we'll change our mind before those plans
so i would say, as long as she knows that you are not marriage material, still you can be a person who can give love and be loved without the need of having the marriage title

why would it lower her reputation? is it a cultural thing? i think you are great guy, friend and you would make an awesome boyfriend
i mean, the Shin I know is extremely smart, lots of fun, cheerful, critical thinker, and those are characteristics that any girl would love in a boyfriend
besides the fact that of good looking

　昔からの友達ってのは良いもんだと思う。

今の友達も、将来そういう関係になれるように、ちゃんと正面から向き合おう。