Welcome to the club fella. Just to weigh in, my first few times were a complete shambles too. I had problems getting hard. Also, I've never known a woman to come during her first sexual experience. Girls don't really masturbate like men, especially at that age, and she's probably never had an orgasm in her life. Some girls just don't
know how to come, and normally blame themselves. I can make some girls come in 2 minutes, others can take 30 mins whilst others just can't come at all. Still, they value the 'emotional bond' that you create while having sex, so don't be too worried by it. If you
can make her come though, she'll want you for life.