It seems that I am being seen as the problem person at work?

The sad things is that I saw it coming but I didn't know what to do to stop it. There is a certain type of girl (and I am physical girl) who just exudes femininity and become really imitated/nervous. I find it very hard to talk to these type of girls. (At one point I was afraid that if i got to close that I wouldn't be seen as a girl- major tomboy). I tend to withdraw from these girls. That's what I've been doing at work until I could find the right way to work with her. Unfortunately, its taking too long and she complained to our boss that i was condescending, rude, and unhelpful and probably hated her. I definitely don't hate her shes really pretty, smart, and competent. I have been told that I need to talk to her decently (so far the only one way I have been able to talk to her is by short sentences- like 'go on break')--- I don't know how though. As I told one of my friends its kinda of like being around someone that you have a crush and your tongue doesn't seem to work. Anyone else have similar issues or suggestions on how to make it easier to talk (and where I actually sound friendly instead of fearful and defensive). Thanks.