How to get over her? I'm so depressed?

[Veronica]

Well I like this girl. We're both 16 however she is 7 months elder than me and a junior while I'm a freshman. I got held back by my mom in 1st grade. Well I was sure she liked me and so I started Developing feelings for her. She would call me beautiful and gorgeous. Tell me I'm hilarious and that I'm absolutely amazing. Tell me that she thinks about me a lot. She would walk me to my classes. Turn our conversations dirty and make it seem like I'm Flirting and then say that she was kidding. Well she had a gf and when she introduced me to her. I decided to tell her basically pouring out my feelings for her and she completely friend zoned me saying I'm like her sister and she feels awful about this and that she cares. Needless to say I was crushed. She said that she still wants to continue our friendship and I just said okay and didn't text her again. It's been over a week and I've been ignoring her completely. If I see her I literally turn around and go the other way (did it at least thrice). I doubt she didn't see me doing it. But I can't be near her. I've been so depressed cause I always liked guys and the first time I liked a girl I got rejected. She likes my things on Facebook a lot but I'm thinking of deleting her cause every time she does I die a little inside. I know it's not her fault but I can't pay the nice guy and be friends with her. It's one of those things I just can't do.