The girl I like is way too out of my league?

I wrote way too much, I guess you won't read but please help me!!

The girl I like is probably way too out of my league, so I didn't interact with her a lot before. Then she started conversations with me. I came into a liking to her then. We used to flirt, talk all day and night. She had a big part in my happiness , later in a few months she started ignoring me all of a sudden. I don't know what I did wrong and I probably hate myself now, I am so depressed. First of all she forced me into her life, now she is the one who is ignoring me. She was way tooo nice to me. Now, I don't know what to do? I cried a lot. I hurt myself a lot.
I am 16 by the way if you are wondering.
Any suggestions.
The girl I like is way too out of my league?
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