Girlophobia! Please help...?

alright, am a guy,18 yrs old and a bit shy towards girls. So, i didn't interact with girls that much. Last year, i saw a girl in my institute. And one day she comes out of nowhere and winks at me and waves hi. I was too shocked to reply. But after she kept running after me. Literally, running after me. Like waiting for me at the gate and then she and her friends followed me all the way upstairs. But i didn't talked to her very much. Later we started talking (she started talking), i couldn't. And i couldn't reply to what she says. Too sacred to speak. Like in one year, i didn't say her name. Not even once! The words didn't came out! I have a really good sense of humour but it all gets off when she's around. She was a really charming girl and kept flirting with me all that year. But this girlophobia turned her off. How do i get over this freakin' habit?

No need to say that i didn't ask her phone number and email address etc. I didn't ask from which city she was and when's her birthday and anything else. I really liked her but couldn't say it. Am i a jerk?