Do I appear unapproachable to girls?

In all honesty I'm a nice and good looking guy but I'm shy and quiet around people I don't know well. The thing is girls don't really talk to me. I know a bunch of guys in my school that have plenty of female friends but I have none, I have guy friends though. I just get nervous when talking to girls. What can I do to change this?
Do I appear unapproachable to girls?
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