Advice needed

I have liked a girl for a while now.. she’s from another division and we r both in integrated batch (different ).Few months ago I confessed my feelings but she said she didn’t like me back,she said “it’s not that you look bad or anything, I have heard very nice things of you from my friends, but I don’t wanna be in a relationship rn and I don’t love u back which is needed in a relationship “ I was not sad that day cuz everything went smoothly( I was expecting worse as it was my first time confessing )and I had thought we might be more close now whatsoever.. but she never looked me back or talked to me ever since that day which I didn’t expect.. but I can’t get her off my mind ever since either..I want to talk to her but I don’t want to be that irritating creep guy.. she’s not even in my class that’s the main problem I can’t strike up any conversation with her.. and she’s always with her friends. Is there anything I can do now( apart from liking her post on insta , I have already done that ), the years almost ending and we both will go to college next year..and also the confessing was the first thing I ever said to her ( which was a very bad move, but I didn’t know what to do then )