If you are average height (5"8) is it necessary to work out in order for girls to like you?

I am 5"8 and I am quite thin and as a result I haven't had much luck with girls. Is it necessary to have an athletic body in order for girls to like you?
Is it necessary to look really muscular in order to get a girlfriend these days? It seems like two things from what I have observed in the last year. Height and having a muscular physique.
If you are average height (5"8) is it necessary to work out in order for girls to like you?
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