sex hurts.

i want to have an active sex life but it hurts for me. not to the point where it's like "omg get off of me". but it's very to the point where it's like "i don't want to do this anymore". it's just uncomfortable. it's not my so's fault/doing at all. it's just me. being/getting wet isn't an issue, im 18 years old. but on top of that i don't get my periods anymore. they stopped coming in april. could that have something to do with it?