Why is too hard to make girl friends?

Girls my age leave me left out of meetings, parties etc. I can't make friends with girls my age. I'm a really beautiful girl ( brunette, green eyes) in a foreign country. It was difficult to make girl friends in my other country, but it's the same here. I feel excluded and pretty lonely. I'm 20, I usually hang out with older people, although I look younger.
Why is too hard to make girl friends?
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