Why am I so terrified?

hi so I am a boy and usually I talk with a lot of girls or women cause i tend to get along better with them but recently every time I try to approach this one girl I end up unable to say much to her and end up running off like a fool. I dont even know her that well and I dont usually end up doing this around anyone and was wondering why this might be happening and possibly any solutions there are to this. also she is very confident and always has people around her and while I am confident I prefer not to engage more than 2 people at once.

Why am I so terrified?
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