I wouldn't say unattractive, but more indifferent. You may be below avergae for a guy, but most girls are still shorter than you. You height won't be a major pulling point, but I don't think it would work against you either.
I have a friend who is 6'1 and she is extremely insecure about it, she wouldn't easily date a guy shorter than her, she says she is worried that he would feel emasculated.
I was actually talking to my boyfriend about this the other day. There is a guy my boyfriend made friends with recently who is 5'5. Very short. But he's the most confident, intimidating individual I've ever met. He just seems better than you in every way. My boyfriend is 6'5 270 lbs and he says he has a fearful respect for this guy.
I always thought I would not give much thought to a guy shorter than me but this guy changed my thinking. Something about him and the way he carries himself, the way he looks at you in the eyes when you're talking - makes you feel like the only person in the room. He just commands respect, his manners are impeccable, his voice deep and controlled.
Something about him...
I'm usually good at picking up on people's insecurities but I honestly cannot seem to find his.
He carries himself very well.
He has absolutely no problem with the ladies - and he's not even a 10/10 guy.
It all depends on how you capture others and how you come across.