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Is my **** too small for my age?

I'm 21 years old . My penis is 2(inc) on flaccid and 5(inc) on erect.On flaccid it's not look like a flaccid penis on porns , It's look like a child penis, glans(head) is little bit wider than the other area. I think 5(inc) on erect is average size but on flaccid it's smaller than others. It's very noticeable like when i changing with other boys . Is this normal ? or is this a matter of late puberty ? will my penis grow ?