How much does it hurt to lose your virginity?

First of all, we are both seventeen. I am a virgin. He is not. I've never really done anything sexual so I feel really inexperienced... Despite this I do feel as if I am ready and every time I have slept at his (we share a bed, cuddle, kiss, touch etc.) I have been seriously thinking about it. The the thing is I don't feel scared of actually having sex I am just scared of how much it is going to hurt... So how bad is it?

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