Does sex really hurt for the first time

Not usually. The idea that pain accompanies first intercourse derives from the Victorian times and earlier when women stayed at home and were very inactive; so their hymens were usually intact when they married, and the first intercourse was sometimes uncomfortable because the hymen was being broken.

Nowadays, most girls' hymens are broken by physical activity, so the hymen is broken long before the first intercourse. In fact, if you use a tampon, when you have your period, and inserting that is no problem, then your hymen is already broken. The fact that penis is larger than a tampon is of no importance, since the vagina is made to stretch much wider than the size of a penis. Remember babies also pass through that canal. Don't worry. You will be fine.