Will wearing a trench coat make me look older?

Hi! I'm 14 and the other day at the mall I saw this really cute coat. So I brought it! It's a blck trech coat and it's not that long actually, it only comes down to a bit lower than my hip. It's got a military style. It's got a waist belt too. I looove it! But the peoplem is, i'm worried that it'll make me look old...am I too young to be wearing a trench? Most people my age don't really wear it so yea..I really want to wear it it...what can i do so I can look young while wearing this coat? I look like i'm 18 or something in this coat! I'm 5ft tall so i'm really short!! >_< Help?