How to look like an adult?

I'm 18, a freshman in college. I'm 5'7" and I kinda have a baby face. I barely have facial hair. Because of this I feel like a child. I even look like a 15/16 year old. I don't get any attention from girls. Most of the guys at my college are like 5'10 at least and the girls are my height or taller. It makes me sick. It gets annoying having to look up at everyone. How can I look like an adult? I work out, but I'm slim and my muscles don't get big. What can I do? Can a girl find a short baby faced guy attractive?
How to look like an adult?
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