Why am I ashamed of liking someone?

K I don't really expect a clear answer on this because it might be too deep but I just don't understand why I'm ashamed or embarrassed for liking someone. I'm 16 years old and this is something you'd expect out of a grade schooler. I mean there was a 15 year old that liked me. I at first kinda felt funny about it because she was younger than me but I asked her out and it turned out I really like her. But it was only a crush she had on me and she got over it in a month and asked to just be friends. We are but now I know what's going on in her life and I really worry for her. But now I'm ashamed of the fact that I still like her a lot and I don't know why. Anyone have some insight and maybe a way I can get over it?
Why am I ashamed of liking someone?
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