I'm 20 and have never had a girlfriend

I'm a confident guy but I get shy around girls. I really like someone at Uni, she's single, but I just don't know what to do. Like on telly you laugh at all these funny chat up lines people say, and i'm worried I'd do something like that. One of my mates once said to a girl... "you look as hot as the sun". I cringed as she laughed. I felt embarrassed and i'm the sort to say something ridiculous like that haha. Where do I start?

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