Dose putting in a tampon hurt?

Using tampons shouldn't hurt, although it can be uncomfortable.

Tampons can be uncomfortable because they dry-out the vagina and because they can expand into the cervix so increase menstrual cramps. As long as you're relaxed and insert tampons correctly they shouldn't hurt, if you're tensed-up tampon insertion may be painful as you may have to force the tampon into the vagina and if not inserted high enough muscles will push against the tampon as you move. Make sure you're using lowest absorbency for your flow too, if your flow isn't heavy enough then tampons will dry-out the vagina more and friction will cause small vaginal tears.