I'm afraid to talk to girls. What should I do?

Anonymous
OK so I can talk to girls if it comes up like in a group or something(I'm not a social retard), but like girls I think are cute I see them and think "if I talk to her she'll just be like wtf go away" in my head and don't bother. I'm 21 and I haven't done anything(nothing at all) with a girl and I hate that. I don't know how to ask for a number or a date or anything like that. Even to start out as friends. I've never had a friend that's a girl. :/

How do I get over that and accomplish something?
Updates
+1 y
Oh if it makes a difference it'd most likely be at work it's the only place I see any girls. Once I'm 21(only like 12 days away) maybe it will be other places.
I'm afraid to talk to girls. What should I do?
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