Any advice?

So I'm a freshman with a couple few middle & elementary school kids that I know. There's this one girl who knew me at my worst. In 7th grade I had severe depression and I couldn't talk to anyone about it. I met the girl and we talked for a while but then she began to ignore me. I was devastated and I tried to get her attention several times but to no avail. I moved for approx a year 1/2 but this year I've moved back. I'm in the same high school as her but we're not in any classes together, I tried apologizing today and I felt the same feeling in middle school when she turned to face me for a few seconds and she turned around again. I'm so sad and I just want to know what I can do. Forget about her? Or forever think about how she ignored my apology. I felt super tired and alone because no one hangs out with me in high school, this is my second day of being here and I already feel terrible.